-browser: save xhr.status to local variable
-browser: fix test for xhr.status
-browser: handle case when IE sets xhr.status = 1223 instead of 204
-browser: just after firing "gotStatus", also fire "finished" if method=HEAD or status=204
readme.markdown: API Reference: fix "finished" callback "output" argument description
-node: check for finished state after each userland callback
dummyserver.js: send Content-* headers only when body is sent or method=HEAD
make dummyserver-config.js use karma-mocha-requireHack.js config as a base