Documentation

Ref https://github.com/mapbox/www.mapbox.com/issues/4126

This commit add's a `docs` directory to the main repo and creates online developer documentation for Mapbox Android SDK. To generate the API docs I've added instructions here: https://github.com/mapbox/mapbox-android-sdk/tree/styled-docs/docs

There's a couple pieces to make this real 

- [ ] Move the master default branch to `mb-pages` 
- [ ] Set up publisher to update changes.
- [ ] Add `mapbox-android-sdk` to the [sync-templates](github.com/mapbox/sync-templates) list.
- [ ] Merge https://github.com/mapbox/www.mapbox.com/pull/4149
- [ ] API Interlinks are broken: http://localhost:4000/api/0100/01/01/maplistener.html/ links to http://localhost:4000/api/ZoomEvent
- [ ] Code example shouldn't use script tags

![2014-06-16 at 1 35 pm](https://cloud.githubusercontent.com/assets/32314/3290730/b53129f2-f57c-11e3-9dee-8e1edc7401ef.png)

Ready for review @bleege @tmcw