Added android api doc page
Added pyjnius to android api doc page
Tweaked kivy android doc
doc: tweaked android doc more
doc: Added api stuff to android page
doc: Added link to main android page for apis
doc: Fixed rst typo
doc: Removed api-android (merged with android.rst)
doc: Fixed android doc link
doc: Cleared up 'targeting Android' secction
doc: Added android module doc
doc: Removed tested devices, added explanation