Merge pull request #35 from nazcaspider/devel

fixes for oculus support
OpenGL rotation matrix utilities.
Merge pull request #36 from nazcaspider/devel

fix for picojson no cpp11
picojson: fix the fix to work with MSVC.
Try not to include boost/chrono when it isn't available.
Workaround for old versions of boost.
Disable VideoViewer if Pangolin vars are disabled.
timer.h: Include stdint.h.
Update libuvc function calls to latest. Support specifying vid,pid in URI.
fixes for uvc driver