Minor cleanup of wires I wasn't using.
chapter 6 with multiple versions. asm_bad.rb is written the way the
book asks, with tests. asm_good.rb is written the way I think a good
rubyist should write it. asm_good.rkt is written in scheme in much the
same way, because really, it's one of the best ways to go at it.
Added mork ignores for ch 6