Add tests for moving within scope and add method: move_within_scope(scope_id)
Merge pull request #79 from philippfranke/test_update_position_scope

Add tests for moving within scope and add method: move_within_scope
Add tests for moving to empty list
Merge remote-tracking branch 'upstream/master'

Conflicts:
	lib/acts_as_list/active_record/acts/list.rb