Changed type params for Request and Responder

Now the body must be some type of Enumerator
Made tests work
Moved test to example project

It is, after all, an example...
Simple grizzly server

Perhaps example is too small now to be helpful
Fixed servlet and netty
Merge remote-tracking branch 'origin/develop' into grizzly/ChangeTypeParams

Resolved* conflicts:
	core/src/main/scala/org/http4s/Request.scala
	core/src/main/scala/org/http4s/attributes/Scope.scala
Fixed the ScopeSpec so things compile.