Cell/cleanup: comment typo
bin/textgrounder, THIS.IS.TEXTGROUNDER: (Commented-out) code to find top level of textgrounder tree we're within
print/error: Split util.print into print.scala and error.scala
Serializer: Rename to TextSerializer
Serializer: Rename to serialize.scala, put in package 'serializer'
FeatureVector: Move FeatureValue, FeatureMapper, etc. up to top
util.*/Cleanup: Use consistent FooPackage naming for classes underlying package objects