Fixed redirect bug adding group
Fixed redirecting bugs
Fixed layout group explore
It looks like loop.last isn't working correctly while loop.first is
Fixed bug breadcrumbs not set when fail on adding item
Fixed group model
Added delete group
Updated permissions
Merge branch 'f/issue#38' into dev

Conflicts:
	app/controllers/GroupController.php
	app/models/Group.php
	app/views/group/explore.volt