Updated bbb-lti to fix issues with grails 2.3.6

bbb-lti/.classpath

bbb-lti/application.properties

bbb-lti/grails-app/conf/ApplicationResources.groovy

bbb-lti/grails-app/conf/BuildConfig.groovy

bbb-lti/grails-app/conf/Config.groovy

bbb-lti/grails-app/conf/DataSource.groovy

bbb-lti/grails-app/conf/UrlMappings.groovy

bbb-lti/grails-app/conf/lti.properties

...s-app/controllers/org/bigbluebutton/ToolController.groovy

...pp/services/org/bigbluebutton/BigbluebuttonService.groovy

...i/grails-app/services/org/bigbluebutton/LtiService.groovy

bbb-lti/grails-app/views/index.gsp

bbb-lti/grails-app/views/layouts/main.gsp

...st/unit/org/bigbluebutton/BigbluebuttonServiceSpec.groovy

bbb-lti/test/unit/org/bigbluebutton/LtiServiceSpec.groovy

...lti/test/unit/org/bigbluebutton/ToolControllerSpec.groovy

bbb-lti/web-app/js/application.js