Divorce 'binary' and 'bundle' goals from the 'jar' goal.

Save effort and time by extracting classfile jar creation
logic to JarTask and using this in JarCreate and JvmBinaryTask
to create classfile jars directly.  Previously BinaryCreate and
BundleCreate re-packed jars containing internal classes created
by the JarCreate Task.  Now time is saved by not creating these
middle-man jars at all.

https://rbcommons.com/s/twitter/r/514/