code: public Pairtree getPairtree(final String aBucket, final String aAccessKey, final String aSecretKey) {
          return new S3Pairtree(myVertx, aBucket, aAccessKey, aSecretKey);
      }
docs: Creates a Pairtree using the supplied bucket and AWS credentials.
  
  @param aBucket An S3 bucket
  @param aAccessKey An AWS access key
  @param aSecretKey An AWS secret key
  @return A Pairtree