Merge pull request #52 from msherry/master

comprehensive generated spec for Balanced
add signature to card resource view
formatting fix
rename signature to hash
add support for a card hash addressing #6
add card hash
account email_address not longer required, defaults to null
Add state on credits
Backwards compatibility
Update resources/credits.rst
Update resources/credits.rst
add state to card consistent with ach branch
credit.state description
formatting fixes and anchors work for the credits
really fix the anchors
Merge remote-tracking branch 'original/master'
proposed new format
rm marketplaces, api_keys and merchants
fix debit.update endpoints
credit.update route fix