Fix imports from js-graph-algorithms

Thanks to @leokolezhuk for sharing this patch:
chen0040/js-graph-algorithms#12 (comment)

Author: backspace

Diff for: package-lock.json

@@ -14,6 +14,7 @@
     "build": "ember build --environment=production",
     "lint:hbs": "ember-template-lint .",
     "lint:js": "eslint .",
+    "postinstall": "patch-package",
     "start": "ember serve",
     "test": "ember test"
   },
@@ -84,6 +85,7 @@
     "moment-timezone": "0.5.0",
     "node-sass": "^4.14.1",
     "nokia-font": "backspace/nokia-font#primary",
+    "patch-package": "^6.5.1",
     "pdfkit": "^0.10.0",
     "pouchdb-adapter-memory": "^7.3.1",
     "qunit-dom": "^1.0.0",

Diff for: package.json

@@ -0,0 +1,14 @@
+diff --git a/node_modules/js-graph-algorithms/src/jsgraphs.js b/node_modules/js-graph-algorithms/src/jsgraphs.js
+index 12fbde5..1b112a6 100755
+--- a/node_modules/js-graph-algorithms/src/jsgraphs.js
++++ b/node_modules/js-graph-algorithms/src/jsgraphs.js
+@@ -1202,7 +1202,4 @@ var jsgraphs = jsgraphs || {};
+     jss.FordFulkerson = FordFulkerson;
+ })(jsgraphs);
+ 
+-var module = module || {};
+-if(module) {
+-	module.exports = jsgraphs;
+-}
+\ No newline at end of file
++module.exports = jsgraphs;