minor fixes in strict mode, no version change

git-svn-id: https://plugins.svn.wordpress.org/namaste-lms/trunk@785908 b8457f37-d9ea-0310-8a92-e5e31aec5664
Fixed important issue regarding who can change user roles that administre the LMS

git-svn-id: https://plugins.svn.wordpress.org/namaste-lms/trunk@789316 b8457f37-d9ea-0310-8a92-e5e31aec5664