Create 'add' goal to deploy deactivated applications

Allow the deployment of disabled WARs by using the 'add' functionality
of JBoss AS in place of 'deploy'.

If 'force' is true, the deployed content will have the same state as an
existing deployment, if any. That is, if the existing content is already
enabled, the 'add' goal will also enable the replacement content. If the
existing content is disabled, the 'add' goal will leave the replacement
content disabled.