Spacyfishing

refactor

- updated tests;
- clean HTTP exceptions;
- updated documentation;

new features

- add new component parameters (`extra_info` and `filter_statements` that replace `documentation_required`)
- add new span attributes (`wikipedia_page_ref`, `normal_term`, `src_description`, `other_ids` and `documentation` maintained)

First stable release :fire:

* requests to Entity-fishing;
* service : disambiguation text and concept look-up;
* attach linking annotations to spans and doc;
* documentation;