Implement correct window show/hiding in OS X.
TODO: think about not-deprecated replacement for GetFronProcess and
ShowHideProcess.
Fixed target_link_library in CMAKELISTS.
Added comments.
GetFrontProcess renamed to GetCurrentProcess to fix window closing
issue.
Implement propper minimizing and closing in OS X.
OS X includes wrapped with ifdef.
Merge pull request #10 from 39dotyt/devel-osx

Implemented proper minimizing and closing in OS X