Expand Method so we can replace Scalatra's.
Let Method.apply create and return an extension method.
Upgrade play-iteratee.
Replace enumerators with iteratee callbacks.
Simplify types.
Eliminate handler.
Make stringHandler more useful for routes that return futures.
Parameterize body types.
Revert to Enumerator bodies. Simpler, but I'm still queasy about this.
Reinstate servlet example.
Add spray-revolver so the rest of us can use this branch. :)
Merge branch 'develop' into topic/grizzly-FutureResponder

Conflicts:
	core/src/main/scala/org/http4s/MockServer.scala
	core/src/main/scala/org/http4s/package.scala
	core/src/test/scala/org/http4s/MockServerSpec.scala
	servlet/src/main/scala/org/http4s/servlet/Http4sServlet.scala
	servlet/src/test/scala/org/http4s/servlet/Example.scala