+ Make the org_id optional when creating a project. Closes#131
+ Mark org_id as computed to allow for GCP automatically assigning the org.
+ Add an acceptance test for project creation without an organization.
+ Skip TestAccGoogleProject_createWithoutOrg if GOOGLE_ORG is set.
+ Add a folder_id to the google_project resource, optionally
specifying the ID of the GCP folder in which the GCP project should
live.
+ Document how one can provision a project into a folder, and added a
sample configuration to create a project into an existing folder.
* Skip test without org if service account is used
* Support folders/* or id only for the folder id field
* Allow unlinking of billing account. Closes#133
* Add acceptance test for unlinking the billing account.
* Just apply the resource definition without the billing account instead of setting an empty billing account.
