Use new weather API backend

[dkess]

Our current weather API is no longer working. We need to find a new API and use that instead.

[emmatyping]

We should definitely use http://wttr.in it supports custom formats and one line output.
https://github.com/chubin/wttr.in

[dkess]

This is fixed by #139, but the location API (turning place names into lat/lon) is not very good. We could improve this by using locationiq.com or something similar.