Moodle release 2.5.1
Updated 'Drag and drop onto image' question type.
Updated 'Drag and drop markers' question type.
Updated 'Drag and drop into text' question type.
Updated 'gap select' question type.
Updated question types - deleted files missed in other commits.
Updated Attendance Register mod.
Merge branch 'MOODLE_25_STABLE' of github.com:moodle/moodle into sdc_25
Updated Rocket theme for testing.
Removal of Rocket theme.
Replacing the grey gradient in the menu bar.
Added (circular) profile pic to the front page.