Add PTPayment entity. Change PTBuisnessPersitenceService to PTBusinessPersistenceService. Merge with develop branch
Update travis ci branch
Add Payment Entity to core
Add Payments list to PTInvoice
Change PaymentMethod from String to Enum. Move Payments list from Invoice to GenericInvoice
Update Gin's pom.xml to use Billy-Core 1.0. Move Payments to Billy-core. Test Payments in PDF and SAFT
Remove comments. Add Payment Builder to credit Note
Add Receipt Invoice
Add PTPaymentBuilderImpl's validation strings to FieldNames.properties files
Add license preamble to DAOPTReceiptInvoiceImpl
Fix project to compile with Java6
Add ReceiptInvoice handlers and Persistence service
Remove collection from PTGenericInvoice
Add TestPTReceiptInvoiceIssuingHandler. Fix PTReceiptInvoiceBuilderImpl constructor. Fix PTReceiptInvoiceIssuingHandler constructor. Add PTReceiptInvoices to SAFT-PT. Refactor generate source documents of SAFT-PT
Fix PTSAFTFileGenerator. Add methods to create builders for creditnote and invoice entries.
Merge branch 'develop-ReceiptInvoice' into develop