helper.content_render: Move before/after calls to an other class.
Fix #165: Clean up at_ui module.
Merge branch 'dev-master' into route-editable

* dev-master:
  Fix #165: Clean up at_ui module.
  helper.content_render: Move before/after calls to an other class.

Conflicts:
	at_ui/at_ui.module
	at_ui/misc/css/cm.css