Filter for Shipping Method Full Label

Adds a filter on the shipping method full label value in the cart
shipping methods template
Check wp_insert_user for WP_Error
Merge pull request #2348 from krbvroc1/insert_user_fix

Check wp_insert_user for WP_Error
Merge pull request #2343 from justinstern/master

Give Shipping Methods Control Over Their Cart Full Label
prettyphoto title / overlay z-index