Builds on Mavericks

I made some changes to the CMAKE configuration for Mozart2 to compile on Mac OS Mavericks. Most of the changes are related to changes in the C++ headers location. 

I did my best for the changes to be backward compatible but I cannot test (I do not have 10.8 anymore). User testing is highly appreciated. Only one change could affect other systems: the version of googletest is fixed to revision 662. A problem with 663 (current trunk) prevented mozart to build on MaOS.

Can anyone provide some feedback?