FIX: Sharing link stood visible after using browser’s back button
Update DEVELOPER-ADVANCED.md

To install the gem pg-0.15.1, you need to have libpq-dev installed. Otherwise bundle install will fail.
See http://stackoverflow.com/questions/16788062/error-running-gem-install-pg-v-0-15-1
API addition: HTTP PATCH support for /groups/xxx: incremental membership changes
Update DEVELOPER-ADVANCED.md

Merged installation instruction for libpq-dev into step 4.
Update DEVELOPER-ADVANCED.md

Fixed numbering of list items.
check that `changes` param is present
Merge branch 'master' into group-admin-incremental
return a promise instead of triggering bootbox in model
Merge pull request #2994 from techAPJ/patch-5

sort screened IPs by match_count
Merge pull request #2993 from techAPJ/patch-4

Return a promise instead of triggering bootbox in model
translate welcome message images to cs
Add more SSO logging for failure conditions
Add more logging for blank posts to detect culprit
Merge pull request #2989 from jmay/group-admin-incremental

API addition: HTTP PATCH support for /groups/xxx: incremental membership changes
Merge pull request #2983 from fwoelm/patch-1

Update DEVELOPER-ADVANCED.md
FEATURE: Localize SSO error messages
Merge pull request #2995 from Mikulas/patch-cs-welcome

translate welcome message images to cs
fixing the reply-to tab z-index bug
Merge pull request #2997 from awesomerobot/master

fixing the reply-to tab z-index bug
FEATURE: API endpoint for inviting an admin