user json field in answer serialize, ajust template and loads last answer for an activity in lesson view, refs #115
start to implements directive to replace flat-ui, refs #115
resolve json serialization problems
fixes validation bug allowing @ in usernames
Merge branch 'master' into issue115

Conflicts:
	lesson/serializers.py
	lesson/static/templates/activity_trueorfalse.html
only restores the public schema on staging
copies static user files from production to staging
touch wsgi-reload file for reloading the uwsgi
touches wsgi-reload for staging as well
replace fake dropdown by <select>
Merge branch 'master' of github.com:hacklabr/timtec
remove forgotten code
fixes #115
Merge branch 'issue115'
no need for them anymore
disabled travis, giving too much trouble
fixing layout for mobile's lesson and unit navigation
remove hardcoded link that fixes #192
remove links that heads to lessons and units for unenrolled users and inactive lessons, closes #161
user json field in answer serialize, ajust template and loads last answer for an activity in lesson view, refs #115