refactored the pointer usage in insertPrincipalMetadata
fix added tx.Rollback in err handling
synch version with pre-release codebase
Merge pull request #62 from chruffer/principal_refactored

refactored the pointer usage in insertPrincipalMetadata
Merge pull request #63 from wongak/ver

synch version with pre-release codebase
Merge remote-tracking branch 'upstream/master' into fritzpay
fritzpay simulate payment service provider (PSP)