Fixes issue 912 - AndroidAudio now resumes after unlocking on pre-Jellybean devices

#912
* Android Audio now functions correctly on pre-Android 4.1 (pre-Jellybean). Now resumes after unlocking instead of at the lockscreen.
* No breakages
* Implements the second solution from: http://android-developers.blogspot.com/2011/11/making-android-games-that-play-nice.html
* Minor formatting

Tested on: 
ZTE Valet (Android 4.1.1). 
Amazon Kindle Fire (Android 2.3.3)
Nexus 7 (2013) (Android 4.4.2)

Everything works as expected.