Author: Rajesh Taneja
MDL-40058 mod_wiki: Replaced add_to_log for page_viewed with event
http://git.moodle.org/gw?p=moodle.git;a=commit;h=8ac1d224369f019a6c8d6eae27844c4f538e1f27
http://github.com/moodle/moodle/commit/8ac1d224369f019a6c8d6eae27844c4f538e1f27
+ 2.7 en [eventpageviewed,mod_wiki]