Merge pull request #10 from tgfrerer/feature-elinuxProgrammableGL

fix OS X specific adaptions for oF with GLFW batteries included
ofTexture: remove glType and glFormat which are now passed optionally on allocate and loadData
Merge branch 'feature-elinuxProgrammableGL' of github.com:arturoc/openFrameworks into feature-elinuxProgrammableGL
imageLoaderExample: remove programmable gl checks, ofTexture manages automatically now