uses old CommandLineParser class

added posibility to specify device on which tests will be executed

fixed some bugs in gpu module

wrote more complicated tests for them
implemented own version of warpAffine and warpPerspective for different border interpolation types
refactored some gpu tests

removed void integral(const GpuMat& src, GpuMat& sum, GpuMat& sqsum, Stream& stream) - it fails with NPP_NOT_IMPLEMENTED error
updated docs, accuracy and performance tests

update gpu tests

- minor refactoring

removed catch from GPU stereo_bp test as --gtest_catch_exceptions flags exists (but err msg isn't printed in case when there is no GPU)

reworked nearly all of the OpenCV tests (except for opencv_gpu tests) - they now use the Google Test engine.