Make everything more concrete

This update mainly changes the article class to expose a fixed set of fields, the citation pairs also gets improved and now returns a full article in both sides.

Adds a new parse label function

Adds new functionality to parse labels and the flexibility for when we need to access metadata of articles or citations.

Try again to fix zenodo integration

This one should work.

Fix zenodo integration

There was a problem with some of the related identifiers.

Python wos tools with continuous delivery

Some continuous delivery added to the repo.

Add citation graph support

Now wostools support:

• Parsing and support for all wos tags.
• Building a citation graph from a collection of articles.
• Building that graph from the wostools cli.