remove unnecessary deps

Author: troolee

package.json

@@ -41,7 +41,6 @@
     "karma-coveralls": "^1.1.2",
     "karma-jasmine": "^0.3.7",
     "karma-phantomjs-launcher": "^1.0.0",
-    "phantomjs": "^2.1.3",
-    "phantomjs-prebuilt": "^2.1.4"
+    "phantomjs": "^2.1.3"
   }
 }