updated algorithm

I have updated the algorithm for both the problem Zjnue reported and the 
one Ate reported.  I've made one small change to Ate's suggested fix:  I 
save only the executable content in the hash table, not the whole 
transition because we don't need the transition when it's time to apply 
the executable content.

Here's a link to the revised spec: 
http://www.w3.org/Voice/2013/scxml-irp/SCXML.htm
Here's a diff from the published spec: 
http://www.w3.org/Voice/2013/scxml-irp/SCXML_Diff.htm
(The diff tool hallucinates a few changes that aren't there, but it 
doesn't  miss anything.)

Please take a close look and let me know what I've missed.  Also please 
keep looking for other bugs.  We will publish a new last call in a 
couple of weeks, and I would like contain all needed changes.

I will also write a new test for the default history behavior and add it 
to the suite.
-- 
Jim Barnett
Genesys