MOSES: add documentation
MOSES: add new unit test.
MOSES: fix irisUTest

Nil, I think that this fix provides the desired results without
impacting performance. Can you review?
Combo: performance improvement for evaluator

This should help improvie performance slightly for the mixed evaluator
when presented with contin inputs.
Alter the irisUtest to run faster.

We just need the unit test to find a good-enough answer,
not a perfect answer, and not crash/hang/fail while doing so.
moses: Add a boolean version of iris classifier

From Alex, per mailing list discussions.
Merge pull request #243 from linas/moses-wtf

Moses regression fixes