MATH: Added is_diagonal function for dynamic matrices
UMVE: Load multiple meshes from command line, properly remember last path
UTIL: Implemented copy semantics for AlignedMemory class
Use OpenGL 3 and adapt for OS X usage.
Merge remote-tracking branch 'upstream/master'
Merge pull request #100 from Waldteufel/osx

Use OpenGL 3 and adapt for OS X usage
Merge remote-tracking branch 'upstream/master'