Query strings are now being passed to backends

[rhyselsmore]

$ go test
warning: building out-of-date packages:
    github.com/kr/spdy/spdyframing
installing these packages with 'go test -i' will speed future tests.

PASS
ok      _/Users/relsmore/Development/spdy   0.085s

Haven't added in tests for query strings yet, just edited the current tests to support the header.

[kr]

Hey, somehow I missed this actual PR until now.
We can't just add a :query field, since it's not part
of SPDY. Query params have to go in as part of :path.
That part should be taken care of in a4f7cf4.
But we still need to get the query params back out again.
I suspect calling url.Parse on the path will do what we
want, then we can fill in Scheme and Host.

If you want to redo this PR, go for it.
Otherwise I can take care of it.

[rhyselsmore]

I will redo it when I hit LA in 14 hours. Thanks for the guidance :)

[kr]

Wow a4f7cf4 didn't even have a test for query params.
Added in b6b3b6c.