Fix up the docs somewhat.

Installing godep is now described in (at least) 3 places: here, the vsphere getting started guide, and in the development section in the main readme file. It isn't described in the other getting started guides (vagrant, local). We should be more consistent. 

In my opinion, we should only describe it once (in the main readme) and reference that when necessary from the other getting started guides. Then when the instructions inevitably change, we only need to keep it up to date in a single place.