Change amber dependency to 0.12.6 and higher

bower.json

@@ -9,7 +9,7 @@
     "tests"
   ],
   "dependencies": {
-    "amber": "^0.12.6",
+    "amber": ">=0.12.6",
     "jquery": ">=1.7.0",
     "jquery-ui": ">=1.9.2",
     "bootstrap2.3.2": "~2.3.2",