Card "Start Date" fix for FAC

Processing ends prematurely at the gateway for some cards if a "Start Date" is passed.

This release adds an option that turns off passing a Start Date by default and some extended logging if cache transactions are enabled for debugging.

CiviCRM Omnipaymultiprocessor fix

Removed *.mdg.php file due to duplicate loading issues.

Transaction IDs Update

• Added ability to specify a prefix for transactions ids
• Added ability to have the gateway generate a transaction id if not specified.

Fixes related to ThreeDSResponse.php

Fixed issues related to typo in ThreeDSResponse.php namespace declaration.
Removed manually added 'require' statements for 'ThreeDSResponse.php'.

Initial Release

Gateway driver is compliant with Omnipay standards.