Use requests API more efficiently

[ekohl]

By setting the verify on the session, we no longer need to pass it to every request. We also let requests handle GET parameters instead of doing it manually.

I should note that I didn't test this, this is just what I noticed while reading the code.

[yhekma]

Looks good to me. This is the first time for me dealing with a rest api in python, so I'm glad for these kind of corrections. Cheers