Can't disable labels in Magento

Sorry for the first pull request - I hadn't synced my client's code with the forked repo. *oops*

Vehcle-Fits-Mangento stores the labels attribute as a string, which always evaluates as true when cast to a boolean. I've updated the core to accept either (bool) true, or 'true' (case insensitively).

Please consider pulling in :)