Merge pull request #2752 from awesomerobot/master

minor unread circle alignment fix
FIX: highlight in yellow, not blue
FEATURE: highlight in title
Revert "fixing alignment of unread post dot"

This reverts commit 80f87e15d282d8eb3ff9c8c21ea03f19571cd78a.
Update topic-post.scss

fix read state position
try softening highlight on topic stop highlighting categories
FIX: ensure double flagging is impossible due to db constraint
minor hacking to get rails master to work

(note broken cause type mapping changed but close to working)

commented gemfile a bit
More highlight tweaking for search, makes it much easier to theme
Convert category helpers to ES6.
FIX: properly close topics in vBulletin importer

FEATURE: add backtrace when an exception happen (importers)
FIX: post-processing should also happen on first posts (vBulletin
importer)
PERF: faster topic bypass when already imported
Update Translations
Merge pull request #2755 from techAPJ/patch-2

Update Translations
FEATURE: Show an email icon beside posts that arrived via email
FEATURE: reset topic counters at the end of the import
FIX: always show the progress bars when skipping posts/users in importers
FIX: add classes to mobile education panels
FIX: tabindex was not set on the category chooser when creating a topic.
Remove deprecated `Ember.Set`
rename site settings for trust levels as numbers
more renaming of trust level settings