add installation option demo_users
Merge branch 'develop' of github.com:liqd/adhocracy into develop
fixup "add installation option demo_users"
Workaround regression in database backend due to css_classes

Note that we still need to check how css_classes shall be treated in the
database backed staticpages case.
add optional profiling middleware on debug
add a link to event/all to event carousel
add event carousel route

This makes it easier to embed it in 3rd party sides
fix instance template titles

see #727
rm redundant instance filter in event.find_by_instance
move event_filter to model.event.all_q
implement event/all filter API for instance activity
always hide #nav_dummy

#nav_dummy should be removed by diazo. If this is not
the case it sometimes breaks the layout. To avoid that
we don't display it at all.
use model.Event.all_q in user profile
add tag cloud for solr facet
use new tag size function for old tag cloud
Merge pull request #799 from xi/feature-tag-cloud

add tag cloud for solr facet
Merge pull request #792 from xi/feature-profiling

add optional profiling middleware on debug
modify instance stylesheet to be more flexible and extendable
add instance themes
instance theme ui