Address issue TeamDewberry/jmxdatamart#32 (https://github.com/TeamDewberry/jmxdatamart/issues/32) by stopping the Extractor when the Extractor web application is shutdown.  Additional, I removed Guice servlets because we're not really serving up any content (URLs).
Merge pull request #5 from DavidWhitlock/extractor-web-app-shuts-down-extractor

Shut down extractor when web app shuts down (Issue TeamDewberry/jmxdatamart#32)