Better, tested and ready to use.

These are the changes:
 * Add authors' names and e-mails.
 * Add auto detection of SetupArchitecture.
     Proposed-by: Christophe Pujol <chpujol@gmail.com>
                  Lee Bruce <lee_brucefr@yahoo.fr>
 * Remove Setup after installation whether SetupLocation is an URL.
     Proposed-by: Tomas Abad <tabadgp@gmail.com>
 * Add Force feature.
     Proposed-by: Tomas Abad <tabadgp@gmail.com>
 * Improve system architecture detection.
     Proposed-by: Christophe Pujol <chpujol@gmail.com>
 * Improve and add comments.
 * Improve code.