Added cache-control to S3 uploads
 - this only applies to Release and Packages repository files

Conflicts:
	lib/deb/s3/release.rb

Added cache-control to signed file
 - need to add the cache-control to the Release.gpg file on upload

Reverted version number bump

 - this is the upstreams repositories responsibility.

Reverted deb-s3 version in gem lock