Update the GOP API to version w

The newest GOP API version from www.gop.gov/api doesn't require an application key anymore. And, the API (mostly) works now! It still does some weird things, like not returning first name information for non-Republicans (which is bad because you can't tell the difference between Al Green (D TX) and Gene Green (D TX)), refusing to return vote listing on any Democrats, and having some ill-formatted dates ("01-24-202011"). I tried to work round these problems. I added some tests too!