remove commas followed by 3 digits to remove thousand separators in SagePay
Merge pull request #1123 from Shopify/fix_sagepay_thousand_separator

Fix an issue with thousand separators in SagePay
Add BridgePay gateway

http://www.bridgepaynetwork.com/

BridgePay says that to be able to update a transaction the 'Capture'
TransType should not be used since that locks the record. There may need
to be a nightly process enabled on the backend to process the batch of
transactions for the day.

Closes #1120.
Added support for Beanstream Legato