Add timeouts to every request

[mlissner]

An anti-feature of the super-popular requests library is that it doesn't have timeouts by default. This means that if a connection hangs for whatever reason, the program itself will hang...forever.

I filed https://github.com/kennethreitz/requests/issues/3070 about changing this in the next major version of requests, but until then, we need to add timeout values to every request. I think two of the Texas scrapers in #160 are currently frozen for just this reason.

I'll be pushing a release with this fix shortly.