fix gathering helpers (#12)

fix gathering helpers

Author: Robert Jackson

lib/gather/analyze-ember-object.js

@@ -5,6 +5,13 @@ module.exports = function analyzeEmberObject(possibleEmberObject) {
   if (possibleEmberObject.default && typeof possibleEmberObject.default.proto !== 'function') {
     return undefined;
   }
+
+  if (possibleEmberObject.default.isHelperFactory) {
+    return {
+      type: 'Helper',
+    };
+  }
+
   let proto = possibleEmberObject.default.proto();
 
   // Ember here is assumed to be global when ran within the context of the browser