Initial support for building framework bundles, use BUILD_FRAMEWORK=ON
Merge branch 'feature/osx-framework' of https://github.com/dwimsey/libRocket into feature/osx-framework
Minor fixes for merged code
Merge branch 'feature/osx-framework' of https://github.com/libRocket/libRocket into merge-test

* 'feature/osx-framework' of https://github.com/libRocket/libRocket:
  Minor fixes for merged code
  Initial support for building framework bundles, use BUILD_FRAMEWORK=ON