unicorn 3.0.0pre2 - less bad than 2.x or 3.0.0pre1!

This release updates us to the Kgio 2.x series which should play
more nicely with other applications.  There are also bugfixes
from the 2.0.1 release and a small bugfix to the new StreamInput
class.

The Unicorn 3.x series will supercede the 2.x series
while the 1.x series will remain supported indefinitely.