Upgrade to Couchbase 2.0.1.

Cookbook Bugfixes:

- Use yum_package instead of rpm_package to ensure openssl deps are captured
- Couchbase expects at least a six character password to be set, so cargo-cult some stuff from the mysql cookbook
- Upgrade to CentOS 6.4 for the Vagrant VM
- Add headers
- Update readme
- Remove old test kitchen stuff in preparation for upgrade to Test Kitchen 1.0