Bump version to 1.7.2 and update CHANGELOG

Bump version to 1.7.1 and update CHANGELOG

Bump version to 1.7.0 and update CHANGELOG

Update eventmachine dependency version requirements to be less strict.

Fix gemspec.

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