Author: Mark Nelson
MDL-66367 core: added templaterev variable
http://git.moodle.org/gw?p=moodle.git;a=commit;h=e63395bbedd70e847c5918c6592fadb43c5c4ce2
http://github.com/moodle/moodle/commit/e63395bbedd70e847c5918c6592fadb43c5c4ce2
+ 3.8 en [purgetemplates,core_admin]