add django-sendfile to reqs
index updated in realtime + default order is time descendant in search resource
Merge branch 'master' of https://github.com/UnissonCo/dataserver
exposed tag resource and allowed modifications
allow passing dumb tag objects when updating files tags
several fixes: reversion bug (switched to specific branch)+tastypie (see ThumbnailView)+TimeZone warnings (turn Use_Tz=False)
fixes: thumbnail_url field not updatable for markers+fixes for file thumbnail