Merge pull request #20 from error454/master

Remove windows adb command & reference to unused libs
Added link to In-App-Purchase example
Fixed small typo
Added direct r21 links
Added ouyaFacade.isRunningOnOUYAHardware() notes
Added reference images
Added controller images
Merge branch 'master' of https://github.com/ouya/docs
Compressed images
These images are too large for GIT and will move to a new package.
Added controller images
Added fetch gamer uuid docs
One little bit about fetch gamer uuid
Added signing bit
Removed code which dealt with the original unencrypted test purchases. All purchase information is now encrypted
Update docs for new buttonPressedThisFrame/buttonReleasedThisFrame methods
Updated path info
Readded video section to address audiences that watch videos and ones that read documents
Added video length
Added video length