Add RTL support to Discourse CSS pre-processing using the RTLit gem and configurable via discourse.conf
ensure rtlit gem in Gemfile is not required by default
ensure RTLit gem is included and CSS is RTLed if css_rtl is enabled in discourse config
Have reciever handle multiple To addresses
Use same reply-to format in all email fixtures
Add error reply for new error
Implement SSO overriding avatars.

Implemented by having Discourse download the image from the provided URL
and treating it as a custom upload.

Adds two more parameters to the SSO site’s response:

* `avatar_url` specifies the URL of the overriding avatar.
* `avatar_force_update` Discourse does not re-download avatars that
has already been download from the same URL. Setting this to true forces
Discourse to re-download the avatar in `avatar_url`

Note that both parameters are ignored if `sso_overrides_avatar` is set
to false.
clarify on flag reply "more" indicator
UX: Show User popup when clicking on a user in the topic list.
FIX: Load `user-avatar` first.
FIX: Allow links to `name` attributes
update new user tips for less columns , emoji
FIX: add http:// to feed_polling_url if it's missing
add glyph to move dialog button
remove right-arrow on cross-topic oneboxes
Fix min_trust_level for wordpress

min_trust_level in the wordpress method was being set to 1 always, the order of the ternary operator was reversed.
Only show unique badge titles in the Badge Title dropdown

Filter the preference Badge Title to only show unique badge title names.
https://meta.discourse.org/t/set-title-dialog-shows-multiple-instances-of-the-same-badge/19071
Only show unique badge titles in the Badge Title dropdown

Filter the preference Badge Title to only show unique badge title names.
Updated to use lodash
https://meta.discourse.org/t/set-title-dialog-shows-multiple-instances-of-the-same-badge/19071
Merge pull request #2672 from cpradio/master

Only show unique badge titles in the Badge Title dropdown
remove <hr> between Popular Posts in email digest