AppScale container.
Config doc.
Add -Dappengine.server property for custom appspot servers, i.e. not
appspot.com.  Set env APPENGINE_SERVER to the servername that will be
used to upload the app.  Use -Dappengine.server for the server that will
be running the app.  If you use appspot.com, that is the default for
both so you don't need to worry about setting this.
Add timeout to Appscale.
Refactor a bit.