Git commits in Moodle 3.0.6 by Russell Smith

commit d391b3472a1394028f9e4f6b934a2a6691e9ca51
Author: Russell Smith <mr-russ@smith2001.net>
Date:   Thu, 18 Aug 2016 19:38:12 +0800
Tag:    v3.0.6

MDL-55604 cache: Fix identifier and cacheable_object


commit ffd94de39821a804365d66f66a7af0bfb03a0e5c
Author: Russell Smith <mr-russ@smith2001.net>
Date:   Tue, 16 Aug 2016 10:12:11 +0800
Tag:    v3.0.6

MDL-55272 lib: Allow random_bytes() to return large values.


commit 42a4a52a4c7c0a7cf6292f3314a66eb3648516ef
Author: Russell Smith <mr-russ@smith2001.net>
Date:   Thu, 21 Jul 2016 07:57:18 +0800
Tag:    v3.0.6

MDL-55292 performance: Allow Tideways profiler extension.