added RGB <-> XYZ color conversion.
gpu morphology minor fix.

warnings in cxcore
added graphcut wrapper

added gpu::cvtColor for BGR5x5 <-> BGR and BGR5x5 <-> Gray.

added gpu exp, log, magnitude, based on NPP.
updated setTo with new NPP functions.
minor fix in tests and comments.

adding setup for some sample applications that use OpenCV on the android platform - nothing concrete yet - but soon.

Also, the androi-opencv.mk.in wasn't correct for one of the crystax NDK
build directory setups

minor refactoring of GPU module and GPU tests, split arithm and imgproc parts.

mainly cmake stuff, but in persistance the wcstombs
is not supported on android, and in
sift.cpp there was and ifdef that affected arm and this
causes undefined symbols on android.

Basically just adding lines at top of CMakeLists that alter behavior if ANDROID is set to
true.

adding cmake based android scripts and a reusable android library - samples to follow - haven't tested yet completely