bbb-web: added updateRecordings to the API

 Add help on how to use new screenshare

 Provide a way for users to learn how to use the new screen share as
 the steps to launch it differs depending on OS and browser.

Add HTTPS support to screenshare webstart app

Bbb web fix max participants by tracking joins

Remove unused scala code

HTML5 - Improvements to Chat. Closes #3207

Minor fixes

Update on user avatar and user item

when force=false or not included
if meta_parameter exists and passed meta_parameter='' update to blank
if meta_parameter does not exists and passed meta_parameter!='' do nothing

when force=true
if meta_parameter exists and passed meta_parameter='' delete
if meta_parameter does not exists and passed meta_parameter!='' add it

* master:
  Hide webcam component

Merge branch 'master' of https://github.com/bigbluebutton/bigbluebutton into bbb-web_fix-maxParticipants-by-tracking-joins-II

Merge branch 'master' of github.com:jfederico/bigbluebutton into bbb-web_fix-maxParticipants-by-tracking-joins-II

Hide webcam component

* master:
  Remove unused imports
  upgrade sip.js to 0.7.5
  Moved polling files back to components folder
  Adds link to meteor issue on comment, remove unused import
  Remove logs, and add some removed code back
  Changes Router in order for the livereloading to work again
  Fixed a small issue with reduce() in the poll annotation
  Made polling buttons accessible
  try to fix the reload issue
  Updated packages and fixed some of the warnings introduced by React 15.2.0
  Centering polling buttons
  Title and calculated styling for the polling UI
  Replaced polling under the whiteboard

Since it is transparent for some SVG files

resolves #3206