* WebRTC Server side
* WebRTC client side
* Bug fixes and improvements
* Pushing UI improvements for webrtc (#3728)
* Pushing UI improvements for webrtc
* Updating webrtc css
* PLT-3943 WebRTC P1: bug fixes and improvements
* Video resolution set to std, reduce volume of ringtone and flip video horizontally
* Fix calling a user B while WebRTC RHS is still opened
* Leave RHS opened when call ends, Fix isBusy on popover and channel_header
* Fix pre-release feature, RHS & System Console
* PLT-3945 - Updating UI for webrtc (#3908)
* PLT-3943 Webrtc p1
* Add ongoing call indicator when RHS is opened
* UI updates to to webrtc notifcation (#3959)
* PLT-4061 - Updating pdf preview pages message
* PLT-4063 - Fixing spacing for LDAP button
* PLT-3837 - Showing reply button on mobile in the RHS
* PLT-4046 - Cantering tutorial on older mobile versions
This allows mattermost to use a non-tls connection with a SMTP server that
supports PLAIN auth (but not LOGIN). The go library explicitly allows PLAIN
auth over non-tls connections - https://golang.org/src/net/smtp/auth.go#L55Fixes#2929
* PLT-3647 Added config settings for email batching
* PLT-3647 Refactored generation of email notification
* PLT-3647 Added serverside code for email batching
* PLT-3647 Updated settings UI to enable email batching
* PLT-3647 Removed debug code
* PLT-3647 Fixed 0-padding of minutes in batched notification
* PLT-3647 Updated clientside UI for when email batching is disabled
* Go fmt
* PLT-3647 Changed email batching to be disabled by default
* Updated batched email message
* Added email batching toggle to system console
* Changed Email Notifications > Immediate setting to a 30 second batch interval
* Go fmt
* Fixed link to Mattermost icon in batched email notification
* Updated users to use 30 second email batching by default
* Fully disabled email batching when clustering is enabled
* Fixed email batching setting in the system console
* Fixed casing of 'Send Email notifications' -> 'Send email notifications'
* Updating UI Improvements for email batching (#3736)
* Updated text for notification settings and SiteURL.
* Prevented enabling email batching when SiteURL isn't set in the system console
* Re-added a couple debug messages
* Added warning text when clustering is enabled
