Bump version.

Downgrade Rack required version back to 1.0 to work w/ prior Rails ve…

…rsions.

Also name version 1.6.1 Death Proof.

Update deps to Rack >= 1.5 and EventMachine >= 1.0

Update changlog and bump version.

Version 2.0.0.pre

Raise an error when no PID file.

Fix error when sending USR1 signal and no log file is supplied.

Add .gemspec.

Tagging thin 1.3.1 codename Triple Espresso

Tagging thin 1.3.0 codename Double Espresso