cli: bump amber-dev dependency to 0.2.0.

Allows not to include specific paths for jquery[-ui]
in app.build.js of the project.

external/amber-cli/package.json

@@ -40,7 +40,7 @@
     "grunt-init-amber": "~0.13.0",
     "grunt-init": "~0.3.1",
     "bower": "~1.3.2",
-    "amber-dev": "~0.1.6",
+    "amber-dev": "~0.2.0",
     "grunt-cli": "~0.1.13"
   }
 }