Merge pull request #4 from udovicic/master

FIx in CMakeLists.txt & FindCameraMatrices.h
restored CMakeLists.txt
added option to compile without SSBA and using OpenCV's contrib bundle adjuster. see option USE_SSBA in the CMakeLists.txt
Fix in CMakeLists.txt
In root folder, added compiler and linker flags for OpenMP. In lib
folder, corrected path for SSBA_LIBRARY_DIR, since CMAKE_SOURCE_DIR.
Changed if clause from if(APPLE) to if(UNIX), because 'UNIX' includes
'APPLE'. Corrected library path.