Fetch all CloudFormation resource types

[anderseknert]

Found a big JSON schema blob from which this could be extracted.

• Add script to pull all resource types and compare to what we have.
• Add cron task to run weekly and fail if there are updates.

If this fails often, we could improve this by automatically commiting the diff, but manually doing that seems fine for the moment.

Fixes #6

Signed-off-by: Anders Eknert anders@eknert.com