CMake adjusted for OS X and homebrew
Fix for issue #4.

hint for fix:
http://stackoverflow.com/questions/9898643/cmake-include-directories-order-after-before
Merge branch 'master' of https://github.com/matteoipri/slowmoVideo

* 'master' of https://github.com/matteoipri/slowmoVideo:
  CMake adjusted for OS X and homebrew