Android support

[mvanroon]

• native code for Android (options.title is being passed on to the native module)
• split up index.js into index.android.js and index.ios.js, since the code for both platforms is very different
• some formatting

[tschoffelen]

Looks good! So is this actually working, or is it just an updated version of the branch?

Any chance you could merge the includable/react-native-email-link branch to resolve the merge conflicts?

[mvanroon]

Wrong branch. My bad.