Add feature to pull team stats from team page

[nickostendorf]

I am currently implementing team stats parsing.

The team stats are loaded through JavaScript, so Mechanical Soup cannot parse them.
However, I've found a way to render the stats with the help of requests_html.

I will add some tests to the test suite and get a PR in before the end of the week.

[esqew]

For organization we'll continue tracking this in #40.