Merge pull request #1 from crazyserver/wip-MDL-35434_master

Filepicker now manage files previously uploaded
MDL-35434 admin theme: Add File Picker to Admin settings in Themes.
MDL-35434 admin theme: Add File Picker to Admin settings in Themes.
MDL-35434 admin theme: Add File Picker to Admin settings in Themes.
Merge branch 'wip-MDL-35434_master' of git://github.com/crazyserver/moodle into crazyserver-wip-MDL-35434_master

Conflicts:
	lib/adminlib.php
	theme/afterburner/db/caches.php
	theme/afterburner/lib.php