Fixed support in GuzzleHttp\Psr7\CachingStream for seeking forward on remote
streams, which can sometimes return fewer bytes than requested with fread.
Fixed handling of gzipped responses with FNAME headers.
1.2.2 - 2016-01-22
Added support for URIs without any authority.
Added support for HTTP 451 'Unavailable For Legal Reasons.'
Added support for using '0' as a filename.
Added support for including non-standard ports in Host headers.
