DRY up dependencies.
Centralize example code.  After all, it's portable.
Merge branch 'develop' into topic/grizzly-FutureResponder

Conflicts:
	core/src/test/scala/org/http4s/MockServerSpec.scala
	project/build.scala
	servlet/src/test/scala/org/http4s/servlet/Example.scala
Centralize Grizzly examples.
Build Grizzly.
Fix directory name.