James is working on the problem.  It appears that our gem is insisting
that Windows users install termios, which they do not need.  In the
mean time, I suggest that Windows users use setup.rb to install
HighLine until we fix the problem.  Ugh... this is why he was hesitant
add a dependency in the first place.  What would be nicer is if someone
could figure out how to prevent stty from failing and letting some keys
through, so we could use that.  Sorry that you're having some trouble,
as neither James nor I are well versed in Windows issues, if anyone
knows how to repackage the software so that this does not happen,
please email James or me on or off list and we'll get a fix out as soon
as we can.  Has anyone had any trouble using setup.rb?  To the best of
my knowledge, this should install 0.6.0 without issues.