Adding gitignore mostly for Qt Creator .user file.
Updated cmake to use OpenCVConfig.cmake.

Also restructured, and added doxygen documentation.
Touch-ups for the cmake file.
Bugfix for OpenCV detection
We're using OpenCVConfig.cmake now.
Adding .orig to .gitignore.
Fixed whitespace in CMakeLists.txt.
Some minor changes to make Doxygen happier
lower case renames (matches opencv).
Merge pull request #2 from utiasASRL/feat/cmake-refresh

merging project config changes (doxygen, .gitignore)