Added dependency on guzzle. NMI Card Transactor now utilizes guzzle for http requests
Fixed issue with error handling in CardTransactor
CardTransactor now properly sets ssl_version to 3
Updated composer.json with packagist orkestra/common and moved symfony/di to require-dev
Fixed all BC breaks caused by orkestra common
Fixed NMI Card transactor test
AchTransactor now uses guzzle instead of HttpKernel
Added unit tests for Transaction entity and TransactorFactory