Pin file-saver to working version

Author: mixonic

bower.json

@@ -10,7 +10,7 @@
     "ember-inflector": "~1.3.1",
     "lodash": "~3.10.1",
     "Faker": "~3.1.0",
-    "file-saver": "^1.3.3",
+    "file-saver": "1.3.4",
     "jstree": "~3.3.0",
     "babel": "^5.8.38"
   },