stop ephemera paragraphs from being inserting into non-editable things
copy change for multipart plugin
update exercise and multipart css
fix exercise button on toolbar
Merge remote-tracking branch 'origin/master' into multipart-css

Conflicts:
	src/plugins/oer/semanticblock/lib/semanticblock-plugin.coffee
	src/plugins/oer/semanticblock/lib/semanticblock-plugin.js
put semantic block controlls back for solutions
fix visual glitch with exercise solution controls
Merge pull request #73 from oerpub/multipart-css

refactor css for exercises and multipart exercises to take up less visual space
Merge pull request #74 from oerpub/math-selected-fixes

Only run mathjax once for root editor.
tweak image dialog forms
Merge branch '56798468' into testing