Update after field testing with more clients

Changes

Outputs

• add project_number as an output
• remove subnets as an output; was not an accurate representation of all subnets and was redundant since subnets were itemised by caller

Google-beta provider

• first change for google vs. google-beta provider split as of 2.0+

GA release

Do not disable API on destroy/change.

There was a race condition that was seen when destroying projects; sometimes the Compute API would be disabled before VM or networks had been cleaned-up. This has the side-effect of preventing an API from being disabled when no longer specified in the template.