Git commits in Moodle 2.5.x by Matt Petro

commit b095ee9f3aa8662a016e55c9cdd7d7abce6a4b72
Author: Matt Petro <petro@engr.wisc.edu>
Date:   Fri, 07 Feb 2014 02:32:04 +0800
Tag:    v2.5.5

MDL-44029 mod_quiz: Fixing group deleted handler so it does not remove user overrides.

commit 8917283c22e76c154a686d5c05b412764e553b8f
Author: Matt Petro <petro@engr.wisc.edu>
Date:   Mon, 09 Sep 2013 05:22:33 +0800
Tag:    v2.5.3

MDL-41660 backup ims-cc: Use correct temp directory

commit f5f36584801fb6873530ebd23f0d8b5734aae703
Author: Matt Petro <petro@engr.wisc.edu>
Date:   Tue, 16 Apr 2013 19:19:23 +0800
Tag:    v2.5.0-rc1

MDL-34403 mod quiz: fix error during enrolment

commit a538cf839e5fa1a205facdb97dc2364be474d010
Author: Matt Petro <petro@engr.wisc.edu>
Date:   Fri, 02 Nov 2012 23:07:02 +0800
Tag:    v2.5.0-beta

MDL-36025 qtype calculated: Fix handling of "-0"