Fix: Compatibility with RN 0.29.0 and later

[techrah]

• Uses the lowest compatible version of com.facebook.react:react-native (0.17.+)
• Updated README.md, including some error fixes.
• Updated version in package.json from 0.17.3 to 0.18.0 to indicate that this version breaks compatibility with previous version.
• Moved babel presets from .babelrc to package.json to prevent 'Couldn't find preset “es2015”' error when developing.

[techrah]

I still need to do a npm install --save-dev babel-preset-es2015 on the main project in order to avoid 'Couldn't find preset “es2015”...' error.