Use ANDROID_NDK instead of ANDROID_NDK_HOME (that's what the build script uses)
Add support for URA, or Unified Renderer Architecture for audio
 * Unified all renderers into common class 'ALAudioRenderer'
 * LWJGL and Android now implement the AL / ALC / EFX interfaces to provide a common OpenAL backend for jME
 * Added support for OpenAL Soft "Pause Device" extension, which allows the engine to pause the context while running in the background (currently requires OpenAL soft 1.16 and thus is Android only feature)