Polishing the programmatic interface to the rep...

Polishing the programmatic interface to the repl and other bits
of machinery which we'll have to live with for a while. The repl
classloader now works more like you'd expect a classloader to, as seen
here:

  % scala -Dscala.repl.power

  scala> class Bippus extends Traversable[Int] { def foreach[U](f: Int => U) = () }
  defined class Bippus

  scala> intp.classLoader.getResourceAsStream("Bippus").bytes()

  res0: Array[Byte] = Array(-54, -2, -70, ...

  scala> res0.size
  res1: Int = 23954

  scala> case class Bippy(x: Int)
  defined class Bippy

  // classBytes is shorter way to say the same thing scala>
  intp.classLoader.classBytes("Bippy").size

  res2: Int = 2356

  scala> intp.classLoader.classBytes("Bippy$").size

  res3: Int = 1741

Closes #4399, no review.

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