unicorn 1.0.1 - bugfixes only

The first maintenance release of 1.0.x, this release is
primarily to fix a long-standing bug where the original PID file
is not restored when rolling back from a USR2 upgrade.
Presumably most upgrades aren't rolled back, so it took over a
year to notice this issue.  Thanks to Lawrence Pit for
discovering and reporting this issue.

There is also a pedantic TeeInput bugfix which shouldn't affect
real apps from the 1.1.x series and a test case fix for OSX,
too.