Updated slurper and other features

[WIP] Add github actions to run test and publish to pypi (#72)

* Add github actions to run test and update to pypi

* Fix some tests.

* Skips were added to the tests relying on the mannheim drugbank sparql endpoint.
* Updated ttl urls to the fhir examples.
* Updated cli help file.
* Update json-ld text used in the schemaorg tests.

* Fix error on setup.cfg file

* Fix errors when importing library on changelog

* Fetch tags on actions to obtain correct version in tests and rerun test_n3_mapper

* Fix run of n3 mapper tests

* Use pipenv for n3 mapper

* Final adjustments to github action