Changed the connection's `pointer-events` from `all` to `visibleStroke`.
Changed the element's hover style.
Synced jsPlumb.
Synced jquery.xselectable.
Added `-moz-box-sizing` style to chat message text field for Firefox.
Reset socket count, editors' badges and chat users on socket connect.
Optimized drag events.
Fixed space not working in chat.
Changed the key events to use `which` property instead of `keyCode` to normalize the behaviour across browsers.