Rename since it's no longer a helper.
Rename the test class.
Add ORM::unloaded_instance() that gives us a new version of the current
model but preserves whatever other database operations were in the chain.

follow-on to 88b6865f472b4203b9ef04d4b99e3310ecb960d2
Reload the root item in test_i_can_edit() so that we get a fresh
related AccessCache model after adding the new group.  Now that we're
using relationships which cache their results, we'll have to do more
reloading.

All Access_Test tests now pass!
Merge branch 'kohana_3' of github.com:gallery/gallery3 into kohana_3