added reopening for submitted evaluations;
added course challenge relation for dummy users d1-d3;
notification polling at 1 min now
refactorings evaluation search and submission/reopening;
Merge remote-tracking branch 'origin/master'
more comment styling. starting to look good...
even more comment styling. now with avatar. plus first steps in new comment form css
better new comment form css, also edit css. small problems persist
some more notification css'ing. still not there...
notifications now show date. also: beautiful, good enough for now.
added promote/demote comment
added comment_body and response_body divs