upgrade react native 51

package.json

     "jsdoc": "3.x.x",
     "jsdoc-to-markdown": "3.x.x",
     "mocha": "4.x.x",
-    "react": "16.0.0-beta.5",
-    "react-native": "0.49.x",
+    "react": "16.2.0",
+    "react-native": "0.51.x",
     "react-redux": "5.x.x",
     "react-test-renderer": "16.0.0-alpha.12",
     "redux": "3.x.x",