Bioprov

* Add more Provenance classes [x]
* Improve Provenance graph [x]
* Add contributing guidelines [x]
* Refactor config and prov modules [x]
* Add CLI options to show config [x]
* Rename src.program to src.main [x]
* Refactoring tests: joining src.program and src.sample tests into src.main [x]

* Add W3C-PROV tutorial [x]
* Small tweaks to default arguments in Program and File module [x]

* Fix PresetProgram.add_parameter bug [x]
* Add basic Tutorial [x]
* Refactor SeqStats data class [x]
* Improve Provenance classes [x]

* Patching more JSON IO bugs [x]

* Refactor functions in src.files module [x]
* Add support for BioPython AlignIO module [x]
* Patching src.program module [x]
* Improving JSON serializers [x]