Invoke ContextDeployer automatically when a webapp is downloaded and installed

[GoogleCodeExporter]

Use the ContextDeployer to automatically deploy a webapp that has been
downloaded and installed. 

Even if the ContextDeployer's scan interval is set to 0, we should be able
to programmatically invoke it to get it to deploy the just-installed webapp.

Original issue reported on code.google.com by [email protected] on 27 Apr 2009 at 2:31

[GoogleCodeExporter]

Need to update to the jetty-7 style DeploymentManager and their webapp and 
context deployers, both of which can do hot-deploy.

Original comment by [email protected] on 19 Aug 2011 at 5:27