AdminView page progress

Added List of all members. For some reason list is stacked? Delete
button todo.
Added List of all groups. Disabled on view, need a few tweaks.
Added a dao function to retrieve all group IDs (seemed easier this way,
modeled after retrieveAllMembers).
Added corresponding UIbuilding blocks (modeled after ContentBox).
Merge remote-tracking branch 'origin/master'

Conflicts:
	application/models/admin_model.php
Merge branch 'master' of https://github.com/erkkiperkele/Flubber_Ci