New Projects need Compute Engine API enabled

[mcowger]

By default, new projects (as requested by the docs) need the Cloud Compute API enabled, which isn't true y default. They need to be enabled by accessing https://console.developers.google.com/apis/api/compute.googleapis.com/overview?project=\<projectid>

The docs should be updated the reflect this, otherwise users will receive the following error when deploying:

omg-cli: error: parsing zone us-east1-b: googleapi: Error 403: Access Not Configured. Compute Engine API has not been used in project 741080867211 before or it is disabled. Enable it by visiting https://console.developers.google.com/apis/api/compute.googleapis.com/overview?project=741080867211 then retry. If you enabled this API recently, wait a few minutes for the action to propagate to our systems and retry., accessNotConfigured, try --help`

[cf-gitbot]

We have created an issue in Pivotal Tracker to manage this. Unfortunately, the Pivotal Tracker project is private so you may be unable to view the contents of the story.

The labels on this github issue will be updated when the story is started.