core/video: separate PyGST / Gi Gstreamer video providers in 2 separate modules. refs #1689
audio: implement a separate Gi-based audio provider, and automatically deprecate Pygst if gi is find.
camera: same as audio, add a core provider based on Gi.
audio/video: few import fixes
Fixed radio button active state
Fixed radio button active state
Fixed checkbox.py
use correct transition in screen_manager.switch_to if user passes  option like it's described in the docs
uix:TextInput introduce `cut`, `copy` and `paste` fiunctions.
core:Clipboard_android simplify backend to simplify usage.
remove redundant return
Update android.rst

I tested the memory game from the contests on my Kindle Fire 2, and it worked well. So did my test chat server. I haven't done extensive testing, however, but it seems functional for practical purposes.
Merge pull request #1704 from kumoshk/patch-1

Update android.rst
Merge pull request #1702 from kivy/cut_copy_paste

uix:TextInput introduce `cut`, `copy` and `paste` fiunctions.
Merge pull request #1695 from edoz78/master

Fixed active state for radio button
core/gi: dont use Gi bindings for older gstreamer (< 1.0)
modules: add late configuration if module has been added manually before the window creation. closes #1668
interactive: fix examples and add a note about how the examples can be runned. refs #1608
vector: fix rdiv + reactivate vector/rdiv tests. closes #1545
property: remove the _a assignation, mostly useless in that case. closes #1534
 Link setting up other win envs. to wiki pages.