Change the deps to help investigate facebook/react-native#10882.

Two changes:
- Set the dev and peer dependencies correctly. This happens to not be
  necessary for react-native-easy-toast as it is written, but it would
  be necessary if e.g. we were writing unit tests for this component.
- Add a babelrc, required for compilation when running with 'npm link'.

.babelrc

@@ -0,0 +1,3 @@
+{
+  "presets": ["react-native"]
+}

package.json

@@ -28,6 +28,12 @@
     "url": "https://github.com/crazycodeboy/react-native-easy-toast/issues"
   },
   "peerDependencies": {
+    "react": ">=15.3.1",
+    "react-native": ">=0.20.0"
+  },
+  "devDependencies": {
+    "babel-preset-react-native": "1.9.0",
+    "react": "~15.3.1",
     "react-native": ">=0.20.0"
   },
   "homepage": "https://github.com/crazycodeboy/react-native-easy-toast#readme"