x-gzip content-encoding on downloads in /dist/

[Thom May]

It seems like setting the x-gzip content encoding in /dist/ is causing a variety
of breakage. 
MD5 sums and signatures for tar.gzs are being sent with ContentType x-gzip, 
causing mozilla to try and uncompress a plain text file
tar.gz files are uncompressed when they're downloaded, so the md5 sums are
incorrect for the file on the disk.
Does anyone have any objections to me removing the encoding for *.gz* 
encoding everywhere under /dist?
Cheers,
-Thom