Ideas for v3

• Remove synchronous operations to make the API easier to implement (see original idea)
• Remove plan_id from requests to create a service binding (see original idea)
• Deleting a service instance should delete all service bindings (see original idea)
• Restrict the valid chars for properties that can appear in URLs (see original idea)
• Remove the requires field and use something like JSON schema for describing a binding object (see original idea)
• If all service brokers were stateful, the spec could be cleaner. We should discuss this when thinking about v3. (see original idea)
• Remove required fields which have been deprecated (e.g. the organization_guid field in the Provision request) (see original idea)