send_caption_history_reply_message , update_caption_owner_message , edit_caption_history_message

Happened when meeting and chat messages appeared before the Meteor joined

HTML5 - Improvements to Chat. Closes #3207

Minor fixes

Update on user avatar and user item

* master:
  Hide webcam component

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

* origin/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
  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
  Replaced polling under the whiteboard
  fixes html5 clinet logout and nav-bar
  fixes html5 clinet logout and nav-bar
  fixes html5 clinet logout and nav-bar
  fixes html5 clinet logout and nav-bar

Changes to router and subscriptions