Update to amber 0.15.0.

bower.json

@@ -27,11 +27,11 @@
   ],
   "private": false,
   "dependencies": {
-    "amber": ">=0.14.17 <0.15.0"
+    "amber": ">=0.15.0"
   },
   "devDependencies": {
-    "amber-contrib-legacy": "^0.2.0",
+    "amber-contrib-legacy": ">=0.3.0",
     "amber-ide-starter-dialog": "^0.1.0",
-    "helios": ">=0.5.3 <0.6.0"
+    "helios": ">=0.6.0"
   }
 }