Updated Engine due changes in the lti library
Removed nonused lib file
Verified it is working
Verified real parameters work as well
BigBlueButtonEngine: Validated encoding in case of exception
Removed org.ambasadoro.lti.Roles
Fixed issue when storing parameters on session
Implemented base UI for extraParameters
Added functionality to extraParameters UI
Added logic to handle duration, recording, also extended BBBEngine to include these parameters plus welcome and voicebridge
Changed the login in tool_ui.
* The extraParameter UI is shown when there is no configuration
  in lti_resource_link. After save or cancel the control is redirected
  to the exit page.
Completed a rough and basic version of extendedParameters UI
Completed Basic UI for extraparameters
Implemented custom_reset
Added welcome, recording, duration to BBBEngine
Updated grails version
Added plugin ambasadoro-plugin