Update v1.3.2; DASC descriptors

• Fixed dshow device connection bug for capture app
• Cleaned + documented dshow/opencv compat layer
• Fixed all leftover warnings/issues for compilation w/ Clang
• Fixed aligned allocation issue for platforms missing aligned_alloc
• Removed cpack support (might be cleaned+reintroduced later)
• Cleaned capture app & added 'nice' display for demo purposes
• Removed bad FindOpenCV.cmake script (no need anyway)
• Fix inconsistent missing calib3d header bug in datasets module
• Add DASC descriptor w/ recursive & guided filtering (TPAMI2016)
• Cleaned up LBSP descriptor interface (now up-to-date w/ ocv3.1)
• Add cv funcs to read/write matrices to disk (w/ binary support)
• Fixed some CMake options ordering issues when used in *.hpp.in