Git commits in Moodle 2.7.4 by David Mudrák

commit 3ade25f0b26b46b26c35789e1fa0f2f472b09ea7
Author: David Mudrák <david@moodle.com>
Date:   Wed, 26 Nov 2014 16:07:50 +0800
Tag:    v2.7.4

MDL-48210 updates checker: Fix empty return type


commit aa61ebaad785a916c91df9f73fb44487244624d9
Author: David Mudrák <david@moodle.com>
Date:   Wed, 19 Nov 2014 06:43:21 +0800
Tag:    v2.7.4

MDL-48210 updates checker: Improve cron notifications processing


commit b862253564dd97f477677aa0b316592cf3058423
Author: David Mudrák <david@moodle.com>
Date:   Wed, 19 Nov 2014 06:37:06 +0800
Tag:    v2.7.4

MDL-48210 plugin_manager: Invalidate caches after fetching updates info