Added the ability to undeploy deployed applications for WebLogic, Tomcat, and JBoss

* src/core/auxengine.py
  -- Last check should be for undeploying
* src/core/parse_cmd.py
  -- Added the --undeploy flag
* src/core/undeployer.py
  -- Very basic undeployer invoker routine
* src/platform/jboss/undeployer.py
  src/platform/tomcat/undeployer.py
  src/platform/weblogic/undeployer.py
  -- WebLogic and Tomcat are stable, but JBoss is notoriously
  difficult to fully remove all remnants of the payload from.
  Even metasploit leaves significant traces.  This currently
  undeploys solely from jmx-console
  -- Note that there is no ColdFusion undeployer for a reason.
  Please see the wiki for more info on this.