Merge pull request chef#471 from chef/release-2.2.2

Cutting 2.2.2 release

Have vagrant clean purge existing box before test

Merge pull request chef#426 from chef/2.2.0

Update Readme and small fixes/cleanup to Rake tasks

Enable key insertion on OS X

The fix was released in Vagrant 1.7.3.

Add @cheeseplus to MAINTAINERS.md

So @cheeseplus, what do you think?