enable CUDA support for android
fixed CC arch/pts for android (used sm_32)
fixed compilation warnings in .cu files
added `-Xptxas;-dlcm=ca` and `-target-os-variant=Android` to nvcc flags
fixed CUDA_TOOLKIT_TARGET_DIR for android:

use targets/armv7-linux-androideabi is exists
fixed compilation of gpu-basics-similarity tutorial:

initialize TIMES variable with some default value (10)
Merge pull request #1887 from jet47:android-cuda-6.0