Adjustment of Role update to allow assign when updating the role

Previously the role update did not take into account the assign option and as such you couldn't assign roles.

Have also suppressed the exception being thrown if the limitation already exists so that the migration doesn't fail if the limitation exists.

Version 1.4.6

Merge pull request #11 from gbalcewicz/location-resolver

Added location resolver. Implemented only for field setting value.

"Hello world" release

Please go wild with it and report any findings