Tag MixedModels v0.3.1
Merge pull request #779 from rennis250/metadata-v2

Tag SDL v0.1.2
Tag OpenGL v2.0.1
Tag SDL 0.1.3 + 0.1.4, Tag GLUT 0.3.2

Signed-off-by: Robert J. Ennis <rje@sdf.org>