Serverspec constant is no longer valid in serverspec 2.x

ref: http://lists.opscode.com/sympa/arc/chef/2014-10/msg00027.html

Please also update the documentation at http://kitchen.ci/docs/getting-started/writing-server-test

I spent way too much time trying to figure out why my serverspec tests weren't working.
I'm pretty sure you don't need this with the new serverspec... but maybe? I *do* know this won't work like this