feat(coffee): generate source maps for coffeescript

Generate source maps in the correct location for coffeescript

Author: eddiemonge

templates/common/Gruntfile.js

@@ -118,6 +118,10 @@ module.exports = function (grunt) {
       ]
     },
     coffee: {
+      options: {
+        sourceMap: true,
+        sourceRoot: ''
+      },
       dist: {
         files: [{
           expand: true,