diff --git a/package-lock.json b/package-lock.json
index a0fe113..d5b7501 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "sigplot",
-  "version": "2.0.0-rc18",
+  "version": "2.0.0-rc19",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
@@ -1191,6 +1191,7 @@
       "resolved": "https://registry.npmjs.org/agent-base/-/agent-base-4.3.0.tgz",
       "integrity": "sha512-salcGninV0nPrwpGNn4VTXBb1SOuXQBiqbrNXoeizJsHrsL6ERFM2Ne3JUSBWRE6aeNJI2ROP/WEEIDUiDe3cg==",
       "dev": true,
+      "optional": true,
       "requires": {
         "es6-promisify": "5.0.0"
       }
@@ -1264,7 +1265,8 @@
       "version": "1.2.0",
       "resolved": "https://registry.npmjs.org/aproba/-/aproba-1.2.0.tgz",
       "integrity": "sha512-Y9J6ZjXtoYh8RnXVCMOU/ttDmk1aBjunq9vO0ta5x85WDQiQfUF9sIPBITdbiiIVcBo03Hi3jMxigBtsddlXRw==",
-      "dev": true
+      "dev": true,
+      "optional": true
     },
     "archiver": {
       "version": "1.3.0",
@@ -1313,6 +1315,7 @@
       "resolved": "https://registry.npmjs.org/are-we-there-yet/-/are-we-there-yet-1.1.5.tgz",
       "integrity": "sha512-5hYdAkZlcG8tOLujVDTgCT+uPX0VnpAH28gWsLfzpXYm7wP6mp5Q/gYyR7YQ0cKVJcXJnl3j2kpBan13PtQf6w==",
       "dev": true,
+      "optional": true,
       "requires": {
         "delegates": "1.0.0",
         "readable-stream": "2.3.7"
@@ -1778,6 +1781,7 @@
       "resolved": "https://registry.npmjs.org/boom/-/boom-2.10.1.tgz",
       "integrity": "sha1-OciRjO/1eZ+D+UkqhI9iWt0Mdm8=",
       "dev": true,
+      "optional": true,
       "requires": {
         "hoek": "2.16.3"
       }
@@ -2113,7 +2117,8 @@
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/buffer-more-ints/-/buffer-more-ints-1.0.0.tgz",
       "integrity": "sha512-EMetuGFz5SLsT0QTnXzINh4Ksr+oo4i+UGTXEshiGCQWnsgSs7ZhJ8fzlwQ+OzEMs0MpDAMr1hxnblp5a4vcHg==",
-      "dev": true
+      "dev": true,
+      "optional": true
     },
     "buffer-xor": {
       "version": "1.0.3",
@@ -2545,7 +2550,8 @@
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/console-control-strings/-/console-control-strings-1.1.0.tgz",
       "integrity": "sha1-PXz0Rk22RG6mRL9LOVB/mFEAjo4=",
-      "dev": true
+      "dev": true,
+      "optional": true
     },
     "constants-browserify": {
       "version": "1.0.0",
@@ -2924,7 +2930,8 @@
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/delegates/-/delegates-1.0.0.tgz",
       "integrity": "sha1-hMbhWbgZBP3KWaDvRM2HDTElD5o=",
-      "dev": true
+      "dev": true,
+      "optional": true
     },
     "depd": {
       "version": "1.1.2",
@@ -2970,7 +2977,8 @@
       "version": "1.0.3",
       "resolved": "https://registry.npmjs.org/detect-libc/-/detect-libc-1.0.3.tgz",
       "integrity": "sha1-+hN8S9aY7fVc1c0CrFWfkaTEups=",
-      "dev": true
+      "dev": true,
+      "optional": true
     },
     "detective": {
       "version": "5.2.0",
@@ -3326,6 +3334,7 @@
       "resolved": "https://registry.npmjs.org/es6-promisify/-/es6-promisify-5.0.0.tgz",
       "integrity": "sha1-UQnWLz5W6pZ8S2NQWu8IKRyKUgM=",
       "dev": true,
+      "optional": true,
       "requires": {
         "es6-promise": "4.2.8"
       }
@@ -4097,6 +4106,7 @@
       "resolved": "https://registry.npmjs.org/gauge/-/gauge-2.7.4.tgz",
       "integrity": "sha1-LANAXHU4w51+s3sxcCLjJfsBi/c=",
       "dev": true,
+      "optional": true,
       "requires": {
         "aproba": "1.2.0",
         "console-control-strings": "1.1.0",
@@ -4112,7 +4122,8 @@
           "version": "4.1.1",
           "resolved": "https://registry.npmjs.org/object-assign/-/object-assign-4.1.1.tgz",
           "integrity": "sha1-IQmtx5ZYh8/AXLvUQsrIv7s2CGM=",
-          "dev": true
+          "dev": true,
+          "optional": true
         }
       }
     },
@@ -5129,7 +5140,8 @@
       "version": "2.0.1",
       "resolved": "https://registry.npmjs.org/has-unicode/-/has-unicode-2.0.1.tgz",
       "integrity": "sha1-4Ob+aijPUROIVeCG0Wkedx3iqLk=",
-      "dev": true
+      "dev": true,
+      "optional": true
     },
     "has-value": {
       "version": "1.0.0",
@@ -5264,7 +5276,8 @@
       "version": "2.16.3",
       "resolved": "https://registry.npmjs.org/hoek/-/hoek-2.16.3.tgz",
       "integrity": "sha1-ILt0A9POo5jpHcRxCo/xuCdKJe0=",
-      "dev": true
+      "dev": true,
+      "optional": true
     },
     "homedir-polyfill": {
       "version": "1.0.3",
@@ -5349,6 +5362,7 @@
       "resolved": "https://registry.npmjs.org/http-proxy-agent/-/http-proxy-agent-2.1.0.tgz",
       "integrity": "sha512-qwHbBLV7WviBl0rQsOzH6o5lwyOIvwp/BdFnvVxXORldu5TmjFfjzBcWUWS5kWAZhmv+JtiDhSuQCp4sBfbIgg==",
       "dev": true,
+      "optional": true,
       "requires": {
         "agent-base": "4.3.0",
         "debug": "3.1.0"
@@ -5359,6 +5373,7 @@
           "resolved": "https://registry.npmjs.org/debug/-/debug-3.1.0.tgz",
           "integrity": "sha512-OX8XqP7/1a9cqkxYw2yXss15f26NKWBpDXQd0/uK/KPqdQhxbPa994hnzjcE2VqQpDslf55723cKPUOGSmMY3g==",
           "dev": true,
+          "optional": true,
           "requires": {
             "ms": "2.0.0"
           }
@@ -5367,7 +5382,8 @@
           "version": "2.0.0",
           "resolved": "https://registry.npmjs.org/ms/-/ms-2.0.0.tgz",
           "integrity": "sha1-VgiurfwAvmwpAd9fmGF4jeDVl8g=",
-          "dev": true
+          "dev": true,
+          "optional": true
         }
       }
     },
@@ -5411,6 +5427,7 @@
       "resolved": "https://registry.npmjs.org/httpntlm/-/httpntlm-1.6.1.tgz",
       "integrity": "sha1-rQFScUOi6Hc8+uapb1hla7UqNLI=",
       "dev": true,
+      "optional": true,
       "requires": {
         "httpreq": "0.4.24",
         "underscore": "1.7.0"
@@ -5420,7 +5437,8 @@
           "version": "1.7.0",
           "resolved": "https://registry.npmjs.org/underscore/-/underscore-1.7.0.tgz",
           "integrity": "sha1-a7rwh3UA02vjTsqlhODbn+8DUgk=",
-          "dev": true
+          "dev": true,
+          "optional": true
         }
       }
     },
@@ -5428,7 +5446,8 @@
       "version": "0.4.24",
       "resolved": "https://registry.npmjs.org/httpreq/-/httpreq-0.4.24.tgz",
       "integrity": "sha1-QzX/2CzZaWaKOUZckprGHWOTYn8=",
-      "dev": true
+      "dev": true,
+      "optional": true
     },
     "https-browserify": {
       "version": "1.0.0",
@@ -5583,7 +5602,8 @@
       "version": "1.1.5",
       "resolved": "https://registry.npmjs.org/ip/-/ip-1.1.5.tgz",
       "integrity": "sha1-vd7XARQpCCjAoDnnLvJfWq7ENUo=",
-      "dev": true
+      "dev": true,
+      "optional": true
     },
     "ipaddr.js": {
       "version": "1.9.1",
@@ -5792,7 +5812,8 @@
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/is-property/-/is-property-1.0.2.tgz",
       "integrity": "sha1-V/4cTkhHTt1lsJkR8msc1Ald2oQ=",
-      "dev": true
+      "dev": true,
+      "optional": true
     },
     "is-relative": {
       "version": "1.0.0",
@@ -6090,7 +6111,7 @@
       "integrity": "sha512-KXPvOm8K9IJKFM0bmdn8QXh7udDh1g/giieX0NLCaMnb4hEiVFqnop2ImTXCc5e0/oHz3LTqmHGtExn5hfMkOA==",
       "dev": true,
       "requires": {
-        "minimist": "1.2.5"
+        "minimist": "^1.2.5"
       }
     },
     "jsonfile": {
@@ -6306,13 +6327,15 @@
       "version": "0.1.0",
       "resolved": "https://registry.npmjs.org/libbase64/-/libbase64-0.1.0.tgz",
       "integrity": "sha1-YjUag5VjrF/1vSbxL2Dpgwu3UeY=",
-      "dev": true
+      "dev": true,
+      "optional": true
     },
     "libmime": {
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/libmime/-/libmime-3.0.0.tgz",
       "integrity": "sha1-UaGp50SOy9Ms2lRCFnW7IbwJPaY=",
       "dev": true,
+      "optional": true,
       "requires": {
         "iconv-lite": "0.4.15",
         "libbase64": "0.1.0",
@@ -6323,7 +6346,8 @@
           "version": "0.4.15",
           "resolved": "https://registry.npmjs.org/iconv-lite/-/iconv-lite-0.4.15.tgz",
           "integrity": "sha1-/iZaIYrGpXz+hUkn6dBMGYJe3es=",
-          "dev": true
+          "dev": true,
+          "optional": true
         }
       }
     },
@@ -6331,7 +6355,8 @@
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/libqp/-/libqp-1.1.0.tgz",
       "integrity": "sha1-9ebgatdLeU+1tbZpiL9yjvHe2+g=",
-      "dev": true
+      "dev": true,
+      "optional": true
     },
     "liftoff": {
       "version": "2.5.0",
@@ -7121,13 +7146,15 @@
       "version": "1.6.0",
       "resolved": "https://registry.npmjs.org/nodemailer-fetch/-/nodemailer-fetch-1.6.0.tgz",
       "integrity": "sha1-ecSQihwPXzdbc/6IjamCj23JY6Q=",
-      "dev": true
+      "dev": true,
+      "optional": true
     },
     "nodemailer-shared": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/nodemailer-shared/-/nodemailer-shared-1.1.0.tgz",
       "integrity": "sha1-z1mU4v0mjQD1zw+nZ6CBae2wfsA=",
       "dev": true,
+      "optional": true,
       "requires": {
         "nodemailer-fetch": "1.6.0"
       }
@@ -7160,7 +7187,8 @@
       "version": "0.1.10",
       "resolved": "https://registry.npmjs.org/nodemailer-wellknown/-/nodemailer-wellknown-0.1.10.tgz",
       "integrity": "sha1-WG24EB2zDLRDjrVGc3pBqtDPE9U=",
-      "dev": true
+      "dev": true,
+      "optional": true
     },
     "noop-logger": {
       "version": "0.1.1",
@@ -7201,6 +7229,7 @@
       "resolved": "https://registry.npmjs.org/npmlog/-/npmlog-4.1.2.tgz",
       "integrity": "sha512-2uUqazuKlTaSI/dC8AzicUck7+IrEaOnN/e0jd3Xtt1KcGpwx30v50mL7oPyr/h9bL3E4aZccVwpwP+5W9Vjkg==",
       "dev": true,
+      "optional": true,
       "requires": {
         "are-we-there-yet": "1.1.5",
         "console-control-strings": "1.1.0",
@@ -7877,7 +7906,8 @@
       "version": "1.1.2",
       "resolved": "https://registry.npmjs.org/prelude-ls/-/prelude-ls-1.1.2.tgz",
       "integrity": "sha1-IZMqVJ9eUv/ZqCf1cOBL5iqX2lQ=",
-      "dev": true
+      "dev": true,
+      "optional": true
     },
     "preserve": {
       "version": "0.2.0",
@@ -8021,6 +8051,7 @@
       "resolved": "https://registry.npmjs.org/pump/-/pump-3.0.0.tgz",
       "integrity": "sha512-LwZy+p3SFs1Pytd/jYct4wpv49HiYCqd9Rlc5ZVdk0V+8Yzv6jR5Blk3TRmPL1ft69TxP0IMZGJ+WPFU2BFhww==",
       "dev": true,
+      "optional": true,
       "requires": {
         "end-of-stream": "1.4.4",
         "once": "1.4.0"
@@ -8971,13 +9002,15 @@
       "version": "4.1.0",
       "resolved": "https://registry.npmjs.org/smart-buffer/-/smart-buffer-4.1.0.tgz",
       "integrity": "sha512-iVICrxOzCynf/SNaBQCw34eM9jROU/s5rzIhpOvzhzuYHfJR/DhZfDkXiZSgKXfgv26HT3Yni3AV/DGw0cGnnw==",
-      "dev": true
+      "dev": true,
+      "optional": true
     },
     "smtp-connection": {
       "version": "2.12.0",
       "resolved": "https://registry.npmjs.org/smtp-connection/-/smtp-connection-2.12.0.tgz",
       "integrity": "sha1-1275EnyyPCJZ7bHoNJwujV4tdME=",
       "dev": true,
+      "optional": true,
       "requires": {
         "httpntlm": "1.6.1",
         "nodemailer-shared": "1.1.0"
@@ -9247,6 +9280,7 @@
       "resolved": "https://registry.npmjs.org/socks/-/socks-2.3.3.tgz",
       "integrity": "sha512-o5t52PCNtVdiOvzMry7wU4aOqYWL0PeCXRWBEiJow4/i/wr+wpsJQ9awEu1EonLIqsfGd5qSgDdxEOvCdmBEpA==",
       "dev": true,
+      "optional": true,
       "requires": {
         "ip": "1.1.5",
         "smart-buffer": "4.1.0"
@@ -9257,6 +9291,7 @@
       "resolved": "https://registry.npmjs.org/socks-proxy-agent/-/socks-proxy-agent-4.0.2.tgz",
       "integrity": "sha512-NT6syHhI9LmuEMSK6Kd2V7gNv5KFZoLE7V5udWmn0de+3Mkj3UMA/AJPLyeNUVmElCurSHtUdM3ETpR3z770Wg==",
       "dev": true,
+      "optional": true,
       "requires": {
         "agent-base": "4.2.1",
         "socks": "2.3.3"
@@ -9267,6 +9302,7 @@
           "resolved": "https://registry.npmjs.org/agent-base/-/agent-base-4.2.1.tgz",
           "integrity": "sha512-JVwXMr9nHYTUXsBFKUqhJwvlcYU/blreOEUkhNR2eXZIvwd+c+o5V4MgDPKWnMS/56awN3TRzIP+KoPn+roQtg==",
           "dev": true,
+          "optional": true,
           "requires": {
             "es6-promisify": "5.0.0"
           }
@@ -9585,6 +9621,7 @@
           "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-3.6.0.tgz",
           "integrity": "sha512-BViHy7LKeTz4oNnkcLJ+lVSL6vpiFeX6/d3oSH8zCW7UxP2onchk+vTGB143xuFjHS3deTgkKoXXymXqymiIdA==",
           "dev": true,
+          "optional": true,
           "requires": {
             "inherits": "2.0.3",
             "string_decoder": "1.3.0",
@@ -9812,6 +9849,7 @@
       "resolved": "https://registry.npmjs.org/type-check/-/type-check-0.3.2.tgz",
       "integrity": "sha1-WITKtRLPHTVeP7eE8wgEsrUg23I=",
       "dev": true,
+      "optional": true,
       "requires": {
         "prelude-ls": "1.1.2"
       }
@@ -10210,13 +10248,15 @@
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/which-pm-runs/-/which-pm-runs-1.0.0.tgz",
       "integrity": "sha1-Zws6+8VS4LVd9rd4DKdGFfI60cs=",
-      "dev": true
+      "dev": true,
+      "optional": true
     },
     "wide-align": {
       "version": "1.1.3",
       "resolved": "https://registry.npmjs.org/wide-align/-/wide-align-1.1.3.tgz",
       "integrity": "sha512-QGkOQc8XL6Bt5PwnsExKBPuMKBxnGxWWW3fU55Xt4feHozMUhdUMaBCk290qpm/wG5u/RSKzwdAC4i51YigihA==",
       "dev": true,
+      "optional": true,
       "requires": {
         "string-width": "1.0.2"
       }