Added 'core' to sprinkles list just prior to migration to prevent double initialisation.
Added 'core' to sprinkles list just prior to migration to prevent double initialisation.

alexweissman/UserFrosting,alexweissman/UserFrosting,alexweissman/UserFrosting,splitt3r/UserFrosting,splitt3r/UserFrosting,alexweissman/UserFrosting,splitt3r/UserFrosting