Checkpoint.
Checkpoint 2.
Committing everything up to v0.0.5.

Support for --underscore option to slice2java.
Support for filtering ice sources.
Support for watching ice sources for changes.
Update for sbt 0.13.x and use scala 2.10.3.

Mostly change to new syntax available in 0.13.x. There are some uses of
"<+=" remaining that I haven't found the correct syntax to replace it with
yet.
Remove commented code.