Revert "Added support for the notion of a "disassociated" payment method."

This reverts commit 15a96c45b20b949140e681781400a46d11dbdd95.
Differentiated between Label class for sending labels and Label class for retrieving lables.
CreatedLabel and RetrievedLabel respectively.
Added String analyst field to labels.
In SiftScienceHelper there is also a fix for improper encoding of symbols found in email addresses.