Add Moip gateway
Moving XML/JSON builder logic to a helper class.
Optional parameter 'Pagamento' removed.
Added external URL for payments.
Merge remote-tracking branch 'moip/add_moip_gateway'
fixing fixtures tests
moil gateway #authorize and #capture matching other gateway's interface
Merge branch 'master' of github.com:algorich/active_merchant into add-moip-gateway
removed #authorize and #capture from MoipGateway (left only #purchase)
add the Redecard gateway
Merge branch 'add-redecard-gateway'