- store stun and turn servers in client

bigbluebutton-client/resources/config.xml.template

...ebutton-client/src/org/bigbluebutton/core/model/Config.as

...n-client/src/org/bigbluebutton/core/model/MeetingModel.as

...ton-client/src/org/bigbluebutton/core/model/StunOption.as

...ent/src/org/bigbluebutton/main/model/users/JoinService.as

...rs/org/bigbluebutton/web/controllers/ApiController.groovy