Support Query Strings

[rhyselsmore]

Copied from https://github.com/heroku/webx/issues/25

Query strings are not being passed through to the application.

$ curl -H'Host: foo.webxapp.io' "http://127.0.0.1:8000?test=1&test2=2"

ImmutableMultiDict([])

$ curl "http://127.0.0.1:80?test=1&test2=2"

ImmutableMultiDict([('test', u'1'), ('test2', u'2')])

First test is against the router, second is going straight to the application.

[kr]

I believe this is fixed in a4f7cf4c5e198c993e6c8ce93d32dce45e8d83f0. Still need to verify in production.