update to rtAudio 4.0.12 for win_cb, shoudl recompile for other platforms, closes #2344
android window: ask for 16bits depth at least
ofGLProgrammableRenderer: don't try to set uniforms is shader==NULL
androidAssimpExample: refactor to new API
ofxAssimp addon_config: use assimp from system
android examples: add project preferences file
recompiled 32bit rtAudio 4.0.12 for osx
linux rtaudio libs + rtaudio as linux default
added return by reference to ofMaterials colors, etc
Fix error with bind() in VS2012

Fix #2158
of3dGraphics: optimize cached primitives
makefiles: crossplatform detection + remove default cflags for linux
optimize of3dGraphics
Merge pull request #2349 from rezaali/fix/MaterialReference

Fix/material reference
Merge pull request #2345 from danomatika/rtAudio-win_cb

rtAudio 4.0.12 udpate for  win_cb
Merge pull request #2348 from arturoc/feature-rtaudio4.0.12

linux rtaudio libs + rtaudio as linux default
Merge pull request #2353 from LeoColomb/Fix-ofxNetworks-VS2012

Fix error with bind() in VS2012
of3dGraphics.cpp: optimizations
Merge branch 'develop' of github.com:openframeworks/openFrameworks into develop
Revert "added return by reference to ofMaterials colors, etc"

This reverts commit d08358e449665a0211c60e3aa7ec5cb57b735e17.