Fixed performance bug when downloading a large object with Content-Encoding:gzip, where decompression attempted to load entire object in memory. Also added "Uncompressing" log output if file is larger than 50M, to make it clear the download hasn't stalled.


git-svn-id: svn://svn.chromium.org/gsutil/trunk/src@247 56d8b958-6b11-9cbd-d51d-67dd3ef4e9fa