stubing out equation element
stubbing out some equation plugin functionality
expose insertmath function of math-plugin
make placeholder work without events if whitespace does not need to be managed
tweaks to math plugin to work with equation element
first iteration on equation semantic element
make equation plugin more like mockup
fix equation cursors
Merge branch 'equation-element' into testing

Conflicts:
	src/plugins/oer/math/lib/math-plugin.coffee
	src/plugins/oer/math/lib/math-plugin.js