Merge remote-tracking branch 'origin/master' into router-changes

* origin/master:
  upgrade sip.js to 0.7.5
  Moved polling files back to components folder
  Fixed a small issue with reduce() in the poll annotation
  Made polling buttons accessible
  Updated packages and fixed some of the warnings introduced by React 15.2.0
  Updates to bbb-conf for BigBlueButton 1.1 (mostly changes to support systemd on Ubuntu 16.04)
  Centering polling buttons
  Title and calculated styling for the polling UI
  Mark open chat as active
  Remove some old code
  Changes the way user actions are rendered
  Replaced polling under the whiteboard
  Solve issues from github comments
  Remove color-generator because it is not being used
  polish code
  Updates the userlist

Conflicts:
	bigbluebutton-html5/imports/ui/components/app/container.jsx