Consider including a one-shot include for all external API

[Howy Perrin]

[Howy Perrin]

This has turned out to be done naturally by the design of the library, you can import the public API of each module by importing it's root package:

import ropes.core._
import ropes.dsl._
import ropes.scalacheck._

I think that anything more all-encompassing than this might be dangerous - which modules would it include?