Cleanup and tests

* Add tests for MapTile
* Add tests for TileLayer
Merge branch 'master' of github.com:mapbox/mapbox-android-sdk
Expand tests, add bbox equals method
Merge branch 'master' of github.com:mapbox/mapbox-android-sdk
Merge branches 'infowindow' and 'master' of github.com:mapbox/mapbox-android-sdk into infowindow