about add deflate support to http_gzip_filter_module

[Paul Gao]

I have a suggestion on improving http_gzip_filter_module and want to discuss
with you:

Currently most browsers support both the gzip and deflate compression methods,
and the algorithms of gzip and deflate are almost the same, 
except that the deflate compression removes an 18 bytes header.

In order to save bandwidth, I hope to add a 'gzip_deflate' option which could
support deflate compression when enabled. Default value is Off.

Any ideas?