Fixed leap year bug in Month type
Added createCredentials method to TransactorInterface and all related
Fixed getter bug where 'empty' values would return null in Credentials
Added typecast to Result setters to ensure persistence of string, not null
Added encrypted swiped card account entity, swiped card account no longer auto-updates based on track data
Added an example implementation using NMI
Removed failing (no longer applicable) test
Implemented TrackDecoder functionality with ISO 7813 and 'Enhanced Encryption' support
Removed unnecessary dev dependency on symfony dependency injection
Updated UPGRADE
Merge pull request #23 from tyler-sommer/feature/swiper

Track decoder for decoding swiped card data