updates destroy action to soft-delete matching credit cards across all
retailers when user deletes a credit card
implements functionality to allow updating of address associate with a
credit card
  * when User updates a card's address, a new Address object is
    instantiated based on the values passed in from the form
  * if the resulting Address object matches an existing Address for
    that Creditcard, then nothing happens (e.g., if the user just
    submits the form without changing any of the address info)
  * if the Address object doesn't match an existing address for that
    Creditcard, then the Address is saved and the Creditcard is updated
    so that it's address_id is that of the newly created Address object
Merge pull request #3 from ReserveBar1/feature/allow-updating-of-credit-card-address

implements functionality to allow updating of address associate with a
changes text from "Edit" to "Edit Address" on user's "My Account" page
updates "Edit" to "Edit Address" in My Account page credit card section
Merge pull request #4 from ReserveBar1/update-cc-text

updates "Edit" to "Edit Address" in My Account page credit card section
Merge pull request #5 from ReserveBar1/feature/allow-updating-of-credit-card-address

changes text from "Edit" to "Edit Address" on user's "My Account" page
updates to fix bug caused when trying to update billing address for a
credit card that has no billing address
Merge pull request #6 from ReserveBar1/feature/allow-updating-of-credit-card-address

updates to fix bug caused when trying to update billing address for a
Merge pull request #7 from ReserveBar1/staging

Staging