Add ability to specify redirect port

re-aligned default values to match the red hat packaged tomcat6 defaults
- ajp_port defaults to 8011
- http_port defaults to 8080
- shutdown_port defaults to 8005
- redirect_port defaults to 8443

[issue #1]
Clean up the server-xml.erb file

- removing unnecessary comments
add documentation of classes and defined types
setup spec system
add spec tests
Merge branch 'issues/1_redirect_port'
bump to 0.0.4