Add standard POD sections for CPAN scripts

See http://www.cpan.org/scripts/submitting.html.
Require some module only when they're needed

Signed-off-by: Gustavo L. de M. Chaves <gnustavo@cpan.org>
Fix invokations of the cmd routine

Signed-off-by: Gustavo L. de M. Chaves <gnustavo@cpan.org>
Fix usage of the --verbose option

Signed-off-by: Gustavo L. de M. Chaves <gnustavo@cpan.org>
Add comments

Signed-off-by: Gustavo L. de M. Chaves <gnustavo@cpan.org>