Jiggling.

Extract Stream interface from LazyStream.
Move PresentFeature and VisibleFeature into their respective Maybe interfaces.
Remove 1.0 and 2.0 javadocs (now they're on the gh-pages branch)
Remove a few more uses of SelfDescribing.
Feature.compose(). Also make UnaryOp extend Feature.
Jiggling he way TransformingConfiguration diagnoses problems.