Git commits in Moodle 3.7.0 by Leon Stringer

commit 36b64444204620dba5ae24ab81f07a5c4356f5ce
Author: Leon Stringer <leon@priorsvle.com>
Date:   Sat, 30 Mar 2019 00:13:30 +0800
Tag:    v3.7.0-beta

MDL-64719 cache: Implement purge_current_user() in \cache

commit 8f402dbc66e8a081377b8c34a63c609b66ebc08a
Author: Leon Stringer <leon.stringer@ntlworld.com>
Date:   Wed, 12 Dec 2018 01:22:59 +0800
Tag:    v3.7.0-beta

MDL-58596 core_stats: fixed infinite loop cause by DST change