New test for progress events, .total and .loaded, when response is gzipped
bugfix: zlib response should be described as Content-encoding: deflate
make gzip.py output gzip, add zlib.py
adding test for zlib-compressed response
addressing review comments
move meta tag before testharness
Merge pull request #982 from w3c/hallvors/progress-gzip

XHR test for progress events, gzip responses and event.loaded / event.total values - review is complete :)