Import fixes

Provide the full avatar url when posting out to Slack

Add option to hide user muted/unmuted messages

Add REST endpoint to set user's avatar

[sandstorm]: monkeypatch UploadFS.Store.GetURL to return a relative URL

Sandstorm build: use node and npm from Meteor dev bundle, and don't u…

Quick snap mongo command patch

change utf8 names validation label

Fix #4779

* add best practices

* reverse

* reverse

Was unneccesarily requiring style override for channel icon (#) color.

Fix spelling of email address

Fix WebRTC

Add path prefix to sidenav layout

Optionnal cdn prefix

fixes the auto focus while using ctrl commands