create citrus config and helper
bw citrus logo on footer
Merge branch 'master' into citrus
toggleable live attribute for lectures
add live comments to lectures, json serializers
url parsing and timestamps for comments
fix to show sidebar when needed
darker logo
no comments message for live lectures
take out citrus notification
Merge branch 'citrus'

Conflicts:
	app/views/layouts/course.html.erb
	db/schema.rb