Updated The RxJava Android Module (markdown)
Updating reference to Maven artifact
Fix link.
Add Grokking RxJava
Enable syntax highlighting. Update version.
typo
Consolidated document with content from another wiki page
moving "additional reading" section specific to Android here
pretty much just a copy-edit of https://github.com/Netflix/RxJava/blob/master/rxjava-contrib/rxjava-android/README.md