Require 'yaml' and 'optparse' in the applicable places.

We were still having issues with this, even after updating to the latest master. We can recreate for you if necessary, just let us know!

Chris & Alex & Sheel

```
/Users/pivotal/workspace/cloud_controller_ng/lib/vcap/errors.rb:9:in `<module:Errors>': uninitialized constant VCAP::Errors::YAML (NameError)
	from /Users/pivotal/workspace/cloud_controller_ng/lib/vcap/errors.rb:4:in `<top (required)>'
	from /Users/pivotal/workspace/cloud_controller_ng/lib/cloud_controller.rb:12:in `require'
	from /Users/pivotal/workspace/cloud_controller_ng/lib/cloud_controller.rb:12:in `<top (required)>'
	from bin/cloud_controller:11:in `require'
	from bin/cloud_controller:11:in `<main>'
```