 - Orders class's Method addReceiver updated to accept a fixed amount in a payment to a specific receiver(primary or secundary).
 - Orders class's Method addReceiver updated to accept a fixed amount in a payment to a specific receiver(primary or secundary).

menezes-/moip-sdk-php,mariodias/moip-sdk-php,caiogaspar/moip-sdk-php,moip/moip-sdk-php