Remove spurious warning...

This removes a warning that is outputed by Fog when a S3 bucket name
contains a period. This resulted in excessive logging of a condition when
using Fog to push to a S3 bucket configured to serve a web site. See
fredjean/middleman-s3_sync#10 to see the issue that triggered this commit.
Merge pull request #1815 from fredjean/master

Remove warning when using a period in an S3 bucket name.