added some TODOs
Merge branch 'master' of ssh://athena.dialup.mit.edu/afs/athena.mit.edu/course/6/6.005/git/fa13/projects/whiteboard/cath_yun-eruleman-kateyu
Implemented color and thickness for the oval class.
fixing undo/redo to work from toolbar
Merge branch 'master' of ssh://athena.dialup.mit.edu/afs/athena.mit.edu/course/6/6.005/git/fa13/projects/whiteboard/cath_yun-eruleman-kateyu