Remove setup.rb; its use has been superseded by the gem framework. Also simplify rake test task.
Apply setup.rb removal to updated Rakefile.
Remove CodeMapper.maxcode.
Merge pull request #3 from keithrbennett/remove-codemapper-maxcode

Remove CodeMapper.maxcode.
Merge pull request #2 from keithrbennett/remove-setup-rb

Remove setup.rb