Remove JitsiVideoBridge Plugin

as per request from Dele Olajide
Merge pull request #121 from akrherz/deljitsu

Remove JitsiVideoBridge Plugin as requested by jitsi.org. It is to be replaced by new plugin "Jitsi Meet" from jitsi.org directly
Merge branch 'master' of https://github.com/igniterealtime/Openfire
ofmeet: added domain independent screen share chrome extension