migrate WireMock to org.eclipse.jetty 7.6.15.v20140411

I would take this with a little grain of salt, in my limited testing is seems to working, but i can't get the tests to pass. not sure what the deal is, i don't have a good gradle setup that's why you see my maven pom in .gitignore.

I hope you can use some/most of this change as inspiration.