Merge pull request #86 from turint/master

Adds jitsi-meet.example and README.
Restores invite participants email functionality. Adds the password to the invitation email, for password protected conferences.
Makes chat message notifications more visible.
Fixes issues when given participant does not support all media types.
Adds googLeakyBucket flag to screen sharing mandatory constraints.
Fixes thumbnails wrap after opening chat window. Closes issue #89.
Updates versions.
Fixes focus indicator tooltip showing when we're not focus.
Adds the method focus.setRTCPTerminationStrategy()
Fixes a syntax error. Adds the ability to define a default value for the channel attribute last-n. Parses JSON messages from Videobridge received on the data channel. Fixes unnecessary changing of the value of the channel attribute expire from 15 to 60.
Receives all data-channel events/messages from Videobridge as JSON-formatted text. Renames active speaker to dominant speaker.
Adds a method setChannelLastN to ColibriFocus which sets the default value of the channel last-n attribute and updates/patches the existing channels with it.
Merge remote-tracking branch 'upstream/master'
Makes video aspect ratio an optional constraint in order to fix failures in which available resolutions meet the constraints on the width and height of a requested resolution but none of the available resolutions satisfy the constraint with respect to aspect ratio.
Fix bug with starting recording multiple times.
s/secrect/secret/
Uses glow to indicate that recording is active.
Fixes an issue which could cause last-n settings to not be respected by new channel allocations.
Fix a potential problem with removing old SSRCs.
Audio level indication. Improvements in rollover and active speaker UI.