Test documentation routes

[jmunoznaranjo]

We need a way of checking that the routes specified in the docs are valid after changes in the code, as suggested in #41

[NicolasT]

In reply to #41 (comment):

I don't know any offhand tool for this specific scenario (next to http://www.sphinx-doc.org/en/stable/ext/doctest.html), though it can't be too hard to grab some Markdown parsing library which allows to convert an MD source into an AST or has SAX-style parsing features (i.e. goes beyond a single function turning MD into HTML :-)), then find every code block, split the command line out of it (there's somewhat of a pattern in the document, so splitting on first { and dropping the $ should do) and split out the command output, then actually run the command and compare to the documented output.