small refactor
fixes going into deleted topics for admins
fix missing category data
added pushGroup method to notifications object #1331
added option to remove ephemeralGroups from groups listing
closes #1556

added tag input box to composer when creating a topic
added new routes for viewing tags 'tags' and 'tags/:tagname'
respectively
post_bar.tpl shows the tags of the topic
can edit the main post to remove or add new tags
added a new menu item to header to go to the tags page
deleting a user will delete topic tags too
max 5 tags per topic

asdasd
remove punctuation and limit tag length
delete tag if it has no topics left
return topics tags #1557
latest translations and fallbacks
added no tags language key
added isSelf to account route
limiting user and group creation so that their slugs can't intersect.
closes #1558
upgrade tags to sorted set
closes #1557
closes #1555
fixes redirect loop for empty slugs