bbb-lti: Relocated assets

bbb-lti/grails-app/assets/images/apple-touch-icon-retina.png

bbb-lti/grails-app/assets/images/apple-touch-icon.png

bbb-lti/grails-app/assets/images/bbb.jpg

bbb-lti/grails-app/assets/images/bbb_logo.jpg

bbb-lti/grails-app/assets/images/delete.gif

bbb-lti/grails-app/assets/images/desktop.gif

bbb-lti/grails-app/assets/images/favicon.ico

bbb-lti/grails-app/assets/images/grails_logo.png

bbb-lti/grails-app/assets/images/hide.gif

bbb-lti/grails-app/assets/images/icon.gif

bbb-lti/grails-app/assets/images/icon.ico

bbb-lti/grails-app/assets/images/loading.gif

bbb-lti/grails-app/assets/images/polling.gif

bbb-lti/grails-app/assets/images/show.gif

bbb-lti/grails-app/assets/images/skin/database_add.png

bbb-lti/grails-app/assets/images/skin/database_delete.png

bbb-lti/grails-app/assets/images/skin/database_edit.png

bbb-lti/grails-app/assets/images/skin/database_save.png

bbb-lti/grails-app/assets/images/skin/database_table.png

bbb-lti/grails-app/assets/images/skin/exclamation.png