Update the FindOpenAL module for OS X.  Fix spelling mistakes in CMakeLists.
Fix OpenAL includes on OS X.
Use non-deprecated GL API parameters.  Use modern approach to detect depth buffer size on OS X.
Spelling GenerateGLTexutre/GenerateGLTexture.  Make GenerateGLTexture return void.

Minimal risk change.  Function has 0 clients.
Update OS X installation instructions.
Merge pull request #118 from DeVaukz/develop

Fix OS X build.  Minor cleanup.