[COOK-4655] - Require ec2 gem

Signed-off-by: Sean OMeara <someara@opscode.com>
Version bump to 2.2.2
Publish 2.2.2 Changelog
Version bump to 2.2.3 (for development)
Added support for provisioning General Purpose (SSD) volumes (gp2)
Version bump to 2.3.0
Publish 2.3.0 Changelog
Version bump to 2.3.1 (for development)