Fix for EU-Buckets #26
                
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To access EU-Buckets one HAS to use the VirtualHost-method to address buckets, i.e. instead of
GET /bucket/somekey
Host: s3.amazonaws.com
it has to be
GET /somekey
Host: bucket.s3.amazonaws.com
Yet the canonical string for authorization remains the same for both.
This fix is a quick&dirty soluation that works for me so far. Though it is still necessary to set the ":server" option in establish_connection!. Maybe this should be set as well (at least for :persistent => false)