Add comment about gzip decompression
Add comment about gzip decompression

GoogleCloudPlatform/gsutil,chriskuehl/gsutil-debian,craigcitro/gsutil,fishjord/gsutil,dtjackson/gsutil,GoogleCloudPlatform/gsutil,mattdr/gsutil,dimfeld/gsutil,ttiurani/gsutil,BrandonY/gsutil