Add a loading bar for WebRTC screenshare start up in the Flash client

  Implement end meeting callback url

   To use, add meta_endcallbackurl parameter on the create api call.

HTML5: Enable push chat notifications by default

skip share/unshare of flash webcams using "if" instead of "check".

Vertically align recording tag with the session title

 Prevent long chat message to make the chat area of the client to be resized

Recording processing fixes

 - update rec metadata for all formats

HTML5: Process only meta params from the list of the handled ones

Chat counter and scrolling

Added check for version of node and mongod

Adjust FF60 upload check

Skip userLeaving when meeting is gone.

Webhooks features 2.0

Pulled html5 locales on June 15, 2018

Improve specific HTML5 logs

Chat push notifications timing

Fix for #5454 

by @oswaldoacauan 

Remove cursor when user leaves the meeting.