enhance the whole controls CSS stuff
start with creation of structural nodes
Merge branch 'master' of https://github.com/luhcas/mooc.ip into luhcas-master

Conflicts:
	blocks/Courseware/templates/controls.mustache
adding a ; but still ugly, refs #37
Darstellungsfehler in Chrome behoben

- Switch Toggle in Chrome funktioniert
- Edit-Icons werden nicht mehr verdeckt