GenericInstrumentingBrowser doesn't stop proxy

[johnomalley]

GenericInstrumentingBrowser creates a proxy server but doesn't stop it. This isn't causing any obvious issues during a Maven build... the build terminates and I don't see any hanging processes. But the CLI was hanging the other day using phantomJSDriver. I haven't verified that the proxy had anything to do with it though.

I tried killing the proxy in the quit() method but that doesn't seem to work... the coverage report came up blank. It's not an actual problem yet so I haven't looked into it in any depth but I thought I'd create an issue for the record.