MDL-37028 fixed statement to clear course cache
MDL-40347 Fixed gradebook css overwriting in Canvas
MDL-40733 forum: fix duplciate headings

two integration patches collided..
Merge branch 'wip-MDL-37028-fix2' of git://github.com/marinaglancy/moodle
MDL-28561 blocks_rss_client: Fixed line separator color in bootstrap