show class notes with markdown formatation. Fixes #176
run migrate in update staging
fix preview in forum
fix footer "about". Fixes #177
fix radio buttons on firefox
fix submitting an activity more than once
added django-braces to requirements
imports the production backup into staging db
fix forum answer and remove admin
Merge branch 'master' of github.com:hacklabr/timtec
new format for sql backup
no privilegies or owner when importing db to staging
resolve json serialization problems
Merge branch 'master' into issue115

Conflicts:
	lesson/serializers.py
	lesson/static/templates/activity_trueorfalse.html