Changelog for not-gloss-0.7.3.0

0.7.3.0: - add object models 0.7.2.0: - add option to set initial camera position 0.7.1.0: - add an interface which makes a movie 0.7.0.0: - pass in user options with Options type - add an optional background color argument 0.6.0.0: - use spatial-math 0.2, which uses types from `linear` package 0.5.0.5: - GLUT/OpenGLRaw version bumps