Remove FTGL
Replace SUBDIRS with ADD_SUBDIRECTORY
Added support for compiling static libraries and excluding specific ones
Fixes for building MSVC2013
Updated freetype and gl2ps versions
Update freetype cmake file

The freetype 2.5.2 include files changed in the update from 2.49. This fixes the install step of the freetype cmake file.
Added additional cmath include for MinGw64
Merge pull request #4 from Bihlerben/review/fixMinGw64Compilation

Added additional cmath include for MinGw64
Merge pull request #3 from jcmonnin/freetype_fix

Update freetype cmake file