Merge branch 'develop' of github.com:RocketChat/Rocket.Chat into develop

...-channel-settings-mail-messages/client/lib/startup.coffee

...ail-messages/client/views/mailMessagesInstructions.coffee

...-mail-messages/client/views/mailMessagesInstructions.html

...cketchat-channel-settings-mail-messages/i18n/en.i18n.json

...settings-mail-messages/server/methods/mailMessages.coffee

packages/rocketchat-lib/server/models/Users.coffee

packages/rocketchat-livechat/client/route.js

...rocketchat-livechat/server/methods/sendMessageLivechat.js

server/publications/userAutocomplete.coffee