Upgraded android ndk to r8e

Know we have better c++11 support for thread and mutex
Howerver there seems to be a bug in android to avaid using the c++11 std::string::to_string() functions but i hope this is a minor bug s we can use c++11 more often now
Oh and I tried to get clang3.2 running but I had problems with the c++11 headers too, so i stay on gcc-3.7 for android builds

Additional changes:
- Added a new RGB Fragment to the android app
- Made the VolumeView Widget more flexible (xml parameter color and android:orientation)
- Fixed a bug in the firmwares ledstripe_setcolordirect implementation (red and blue was swapped)
- Use SetColorDirect in Android application for Brightness and RGB Fragment #133