LSNBLDR-394; implement CSRF token


git-svn-id: https://source.sakaiproject.org/svn/lessonbuilder/branches/sakai-10.x@313869 66ffb92e-73f9-0310-93c1-f5514f145a0a
LSNBLDR-423; copying text with url produced from uploading file with space in it fails


git-svn-id: https://source.sakaiproject.org/svn/lessonbuilder/branches/sakai-10.x@313870 66ffb92e-73f9-0310-93c1-f5514f145a0a