update readme
Add Simple Invoices to PTSAFTFileGenerator. Add query to exclude simple invoices from invoices fetched at DAOPTInvoiceImpl.
Remove sun-jaxb.episode file
Fix enum types to work with java ver. 6
Update to support java 6
Merge branch 'master' of github.com:premium-minds/billy

Conflicts:
	billy-portugal/src/main/java/META-INF/sun-jaxb.episode