httparse is a http1 stateless push parser. This not only speeds up
parsing right now with sync io, but will also be useful for when we get
async io, since it's push based instead of pull.
BREAKING CHANGE: Several public functions and types in the `http` module
have been removed. They have been replaced with 2 methods that handle
all of the http1 parsing.
This test case does not attempt to test all the methods exhaustively,
but it does at least test all the methods in the APIs. There's also a
check to make sure that Method can be used as part of a hash-table key.
