Add request timeout option to everything

[mittagessen]

Right now there are no timeouts on any of the API requests. I've added the timeout option on the global state which sets the requests package timeout argument on all the calls.

I can add a short documentation sentence about it to the readme, perhaps in the "On queries and performance" section?

Regarding tests, I'm unsure on how to add sensible ones.

[teleyinex]

Hi,

This is nice :D Quick thing, before merging anything we need you to sign our Contributor Agreement

Now, back to your code: I would say, that for tests we have to mock the request, and make it timeout, so the requests package uses it. What do you think?