Added cmake script to find libhackrf.
Updated hackrf_transfer(host) and ubs_performance(firmware) extended frequency range from 5MHz to 6800MHz.
Fix FindLIBHACKRF.cmake
Fixed hackrf-tools CMake scripts to build them out of tree.
Merge pull request #51 from TitanMKD/master

Updated cmake script to find libhackrf, updated hackrf (host&firmware) frequency range from 5MHz to 6800MHz