Add a test that exposes a problem we have with renaming attributes
Update strip_attribute tests to work with our existing modifications
Fix bug to allow updating attributes when using strip_attributes and globalize3

We do this by making strip_attributes manipulate the unsaved object so
that it doesn't interact with globalize3.

Calling 'record.attributes' would invoke the globalize3 overridden
method, which returns the stale translated attribute values.

We now use the object's values instead which are the ones we have just
assigned and want to update to.