see https://ria101.wordpress.com/2011/12/12/concurrenthashmap-avoid-a-common-misuse/
 - Noticed that Red5 became slow to response after a while and usin Yourkit saw that
   a lot of threads are blocked in GlobalAudio.getGlobalAudioStream

Applied the text styling to the mock text in WebRTCEchoTest

Improvements for the user status icon feature

 - revert back to original hand icon

Implementation of emoji status for users

Conflicts:
	bigbluebutton-client/branding/default/style/css/BBBDefault.css

Phone/Tablet Views.

Merge branch 'master' of https://github.com/bigbluebutton/bigbluebutton into meteor-client-mobile-view

Conflicts:
	bigbluebutton-html5/app/client/stylesheets/whiteboard.less

- Replaced raise hand feature by emoji status in client (WIP)

Made the notifications look appropriately sized regardless of the device type or screen orientation.

Miscellaneous Client fixes for 1.0

Polling update

- Upgraded bbb-common-message version.

Continued transitioning the mobile views to CSS pixels, corrected the sizes of Settings window's fonts/elements.

Fix poll in recording when there are 0 responders

There were a couple of problems:

* A division by 0 when calculating the percentages
* Positioning of the number of results counter was incorrect

Fixes #2739

bbb-conf --clean also cleans logs for bbb-apps-akka and bbb-fsesl-akka