Changed based level example so it can be copied.
The base level example doesn't actually work unless enclosed with a "builders" section. All fixed now.
Previous:
{
"type": "googlecompute",
"account_file": "account.json",
"project_id": "my project",
"source_image": "debian-7-wheezy-v20150127",
"zone": "us-central1-a"
}
Now:
{
"builders": [
{
"type": "googlecompute",
"account_file": "account.json",
"project_id": "my project",
"source_image": "debian-7-wheezy-v20150127",
"zone": "us-central1-a"
}
]
}