Project settings for XCode 4.6.2 and Mac OS X 10.8

* Cinder added as git submodule
* Removed unused OpenMP header
* added cstdlib header fot rand() and RAND_MAX
* Compiler changed to LLVM Clang with C++11 flags
Merge pull request #2 from gloopeezza/master

Project settings for XCode 4.6 and Mac OS X 10.8