Recommend user to not use dots in AWS bucket names

[djvdorp]

This is for both compatibility and performance reasons, and a mistake we made ourselves multiple times. Fog warns you about the performance if you decide to do it anyways:

[fog][WARNING] fog: the specified s3 bucket name(cfapps.io-cc-buildpacks)
contains a '.' so is not accessible over https as a virtual hosted bucket,
which will negatively impact performance. For details see:
http://docs.amazonwebservices.com/AmazonS3/latest/dev/BucketRestrictions.html

Related reads:

• https://github.com/cloudfoundry/cloud_controller_ng/issues/175#issuecomment-36576520
• https://github.com/cloudfoundry/cf-release/pull/573
• https://groups.google.com/a/cloudfoundry.org/forum/#!topic/vcap-dev/h4ZwbAQDyEw
• https://groups.google.com/a/cloudfoundry.org/forum/#!topic/bosh-users/0waAA386RuI
• https://github.com/cloudfoundry/cf-release/pull/312

[cfdreddbot]

Hey djvdorp!

Thanks for submitting this pull request! I'm here to inform the recipients of the pull request that you and the commit authors have already signed the CLA.

[cf-gitbot]

We have created an issue in Pivotal Tracker to manage this:

https://www.pivotaltracker.com/story/show/123426311

The labels on this github issue will be updated when the story is started.

[bentarnoff]

Thanks, @djvdorp !