Freezed versions of some dependencies

Author: SupriyaKalghatgi

package.json

@@ -18,7 +18,7 @@
     "react-native-code-push": "2.0.1-beta",
     "react-native-easy-grid": "0.1.8",
     "react-native-modalbox": "^1.3.4",
-    "react-navigation": "^1.0.0-beta.11",
+    "react-navigation": "1.0.0-beta.11",
     "react-redux": "^5.0.2",
     "redux": "^3.6.0",
     "redux-form": "^6.7.0",