Add deploy/undeploy support
Fix a typo in tomcat.undeploy_old_versions
Rename tomcat.is_clustered to has_cluster
Rename host' to 'vhost' in order to make the API more consistent
Add functionality to forcefully expire all sessions in a webapp
Flatten directory structure and unify Error handling
Implement preliminary clustering support

- rename session_summary to find_managers
- add objectName to every MBean if it is not there
- change keys reported from list_webapps to match webapp context name
- add new TomcatCluster class to drive clusters
Move war file name parsing to a reusable function
Update expire_sessions code to work with new keys
Remove / from application name in list_webapps
Add cluster wide application status function
added check_memory function to determine if any pool usage is over 50%