fix typo+ case sensitive change for sortable dependency

Author: pc-david\david.desmaisons

package.json

@@ -1,6 +1,6 @@
 {
   "name": "vuedragablefor",
-  "version": "1.0.8",
+  "version": "1.0.9",
   "description": "vue dragable for directive",
   "main": "src/vuedragablefor.js",
   "files": [

src/vuedragablefor.js

@@ -131,15 +131,17 @@
           }
         });
 
+        //With typo: should be removed in next release
         Vue.directive('dragable-for', dragableForDirective);
+        Vue.directive('draggable-for', dragableForDirective);
       }
     };
     return vueDragFor;
   }
 
   if (typeof exports == "object") {
     var _ = require("lodash");
-    var Sortable =  require("Sortablejs");
+    var Sortable =  require("sortablejs");
     module.exports = buildVueDragFor(_, Sortable);
   } else if (typeof define == "function" && define.amd) {
     define(['lodash', 'Sortable'], function(_, Sortable){ return buildVueDragFor(_, Sortable);});