added screed and read_parser streaming testing

Marked as known failing since they currently fail.
Will investigate.

Relevant to #393, #654
On Thu, Nov 13, 2014 at 07:31:04AM -0800, bocajnotnef wrote:
> > @@ -224,7 +224,11 @@ def test_not_output_unassigned(self):
> >          ht.output_partitions(filename, output_file, False)
> >  
> >          len1 = len(list(screed.open(filename)))
> > -        len2 = len(list(screed.open(output_file)))
> > +
> > +        try:
> 
> Actually, this appears to break in screed 0.7.1. Not totally sure why; I feel like @mr-c and I had a (verbal) discussion about this. (He was the one who told me to make this change as I recall but I do not remember why nor do I have a documented reason. I'll mention this in a relevant screed thread after verifying that it is screed 0.7.1 causing it.)

Is the outputfile empty here, maybe?

-titus
-- 
C. Titus Brown, ctb@msu.edu