- 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

- fixed printCudaDeviceInfo for new CC
- fixed some compilation errors and warnings
- removed unset command from CMake script
- removed unused std imports

new implementation of gpu::PyrLKOpticalFlow::sparse (1.5 - 2x faster)
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new implementation of gpu::PyrLKOpticalFlow::dense (1.5 - 2x faster)
........