Release 1.3.0

Changelog:

• Parse a missing dr value in HCERT Test entries correctly
• Add class SignedData to hold content and signature of a TrustList
• Add services to encode and decode Business Rules (also called Validation Rules)
• Add services to encode and decode Vaule Sets

We can make no guarantees about the correctness of the implementation, so please do not use it without extensive testing for production use.