Fix for issue #139
Issue #139 identifies two fields that are not sent in the Sage Pay Form reqquest:
SendEMail
VendorEMail
This patch fixes that.
Note the letter case of these fields supplied to the driver are consistent with the general format used across Omnipay, lower camel case with "Email" treated as a single word. Sage Pay tends to use a mix of both upper-case and lower-case across different parts of the API. Use these fields, as described in the documentation:
sendEmail
(integer value)vendorEmail
(email address)