Add initial Centos-6.4 Dockerfile

Change-Id: Iba2088693c171cef197b4c58d24ae4c9d1c64dcc
Reviewed-on: http://review.couchbase.org/39775
Reviewed-by: Chris Hillery <ceej@couchbase.com>
Tested-by: Chris Hillery <ceej@couchbase.com>