chore: updated the ember-cli version to the latest release

Change the reference to ember-cli from a github reference to an npm ref via fixed version
Add errorStream configuration in mock-ui test helper

fixes #73

Author: Brocco

package.json

@@ -31,11 +31,11 @@
   "dependencies": {
     "broccoli": "^0.16.3",
     "broccoli-concat": "0.0.13",
-    "broccoli-funnel": "^0.2.3",
-    "broccoli-merge-trees": "^0.2.1",
+    "broccoli-funnel": "^1.0.0",
+    "broccoli-merge-trees": "^1.0.0",
     "broccoli-writer": "^0.1.1",
     "chalk": "^1.1.0",
-    "ember-cli": "ember-cli/ember-cli#ae5e72614e40f5e6dd57463e526c65da899fde07",
+    "ember-cli": "1.13.13",
     "exit": "^0.1.2",
     "fs-extra": "^0.18.4",
     "leek": "0.0.19",

tests/helpers/mock-ui.js

@@ -12,6 +12,9 @@ function MockUI() {
         inputStream: through(),
         outputStream: through(function(data) {
             this.output += data;
+        }.bind(this)),
+        errorStream: through(function(data) {
+          this.errors += data;
         }.bind(this))
     });
 }