fix figure error on load
Add button to clear the math editor
Merge pull request #161 from oerpub/clear-math-button

Add button to clear the math editor
Merge remote-tracking branch 'origin/master' into bootstrap3-fixes-tom

Conflicts:
	src/plugins/oer/math/lib/math-plugin.coffee
	src/plugins/oer/math/lib/math-plugin.js
Merge branch 'bootstrap3-fixes-tom' into bootstrap3-fixes