This commit not only changes the default method of matching requests
(just match on method and URI instead of the entire request + headers)
but also allows the user to add custom matchers.
This commit changes the whole core internal flow of requests.
Now, requests are actually physically made lazily when a response
is requested. This allows the entire request to be sent at once.
Otherwise, it would be impossible to compare whether requests have
already been recorded, since httplib.send() allows you to effectively
stream requests over HTTP.
Let's not use Google to test redirects since it changes depending on your
geographic location. I changed the test to use httpbin.org, since
a lot of our tests already depend on httpbin.org anyway.
Somedays, I'd like to implement my own local mock HTTP server I
can do asserts against. The test suite would just start it up,
and the server would record the requests, which I could then
retrieve and compare.
Closes#21
