- new reduce implementation (with kepler optimizations)
- saturate_cast via asm command
- video SIMD instructions in element operations
- float arithmetics instead of double
- new deviceSupports function

added GPU non local means brute force filter + tests

fixed MCVC warnings

update gpu tests

added convert functions to BruteForceMatcher_GPU
other minor fixes

fixed BFM warning ("cannot tell what pointer points to")

*fixed some warnings
*finished gpu test port to gtest framework

minor fixes and refactoring of GPU module

added assertion after all kernels calls