NOBUG: Bump to 2.5beta+

we don't package tagged commits in master, so let's
bump to beta+ and get the packaging done.
MDL-38912 prevent time-outs during unit tests.
MDL-38997 badges: Add checks to fix notices if badge settings not yet configured
MDL-38981 Wrong responsetemplateformat restoring 1.9 essay questions
During restore of 1.9 backups, missing responsetemplateformat and
graderinfoformat values should be set to FORMAT_HTML.
MDL-37537 completion: Fix incorrect lang string reference in block
MDL-38011 completion: Use new localised role names
MDL-38786 import YUI 3.9.1
Automatically generated installer lang files
MDL-38798 remove unused property which was giving notices in PHP 5.5beta
MDL-34222 import simplepie 1.3.1
MDL-22153 backup: delete old, unused, 1.9 files
MDL-39004 improve role docs
MDL-39005 unittest: add the upgradelib test template.
MDL-39006 environment: raise all uses of 5.3.2 to 5.3.3
MDL-38750 show errors at the end of OCI setup script

Credit goes to Damyon Wiese.
MDL-37844 SCORM: fix js error and highlight selected node in TOC.
MDL-35840 SCORM TOC: fixed a typo, improvements on getting the focus
MDL-38999 timezones: fix maxyear handling on rule calculation.
MDL-38999 timezones: fixed timezone information.
MDL-39010 theme_bootstrap: ADDED $THEME->hidefromselector = true; to theme/bootstrap/config.php.