Added synchronous on main thread macro
Added AfterDelay macro
Fixed typo
Added range checking macros
Added OpenGL error checking, #ifdefs for when used from C
Merge branch 'master' of https://github.com/fjolnir/FConvenience

* 'master' of https://github.com/fjolnir/FConvenience:
  Added subscripts to NSUserDefaults
Merge branch 'temp'

* temp:
  Added OpenGL error checking, #ifdefs for when used from C