LSNBLDR-208; add downarrow to "more" button


git-svn-id: https://source.sakaiproject.org/svn/lessonbuilder/trunk@121453 66ffb92e-73f9-0310-93c1-f5514f145a0a
LSNBLDR-208 - first UI pass for internal review

git-svn-id: https://source.sakaiproject.org/svn/lessonbuilder/branches/LSNBLDR-208@121495 66ffb92e-73f9-0310-93c1-f5514f145a0a