Cook-4667

Hey friends,

I need to be able to have no action taken on the tomcat service resource at time of convergence. There was another pr (https://github.com/opscode-cookbooks/tomcat/pull/57) doing something simliar, but this is much more flexible and I don't care about the SSL changes being implemented there.

Updated the readme with attribute description as well as added logging output for invalid actions.

https://tickets.opscode.com/browse/COOK-4667