Yarrrml-translator

- Implementing R2RML support
- Solving small bugs

- Modifying name of the module (removing dash)

- Supporting GraphMap translation

- Implementation of joins conditions with multiple conditions
- Support for multiple subjects in the same mapping
- Support for RDB connection with D2RQ

- Refactorizing the code
- New features included, such as the validation of the output file with RDFlib
- Some identified bugs already fixed

Covering features:
- Sources in any form
- Subject in any form (no Graph property)
- POMs (no Functions)