Add type attributes

Registered by Sahdev Zala

As per working draft 2 for specs, attributes are defined. The Attributes element describes one or more typed Attribute definitions that can be associated with a modelable TOSCA entity (e.g., Node Types, Relationship Types, etc.).
e.g.
type: tosca.nodes.BlockStorage
  derived_from: tosca.nodes.Root
  properties:
    size:
      type: integer
      constraints:
        - greater_or_equal: 1
    volumeId:
      type: string
      required: false
    snapshotId:
      type: string
      required: false
  attributes:
    volumeId:
      type: string
  capabilities:
    - attachment: tosca.capabilities.Attachment

Blueprint information

Status:
Complete
Approver:
None
Priority:
Undefined
Drafter:
Sahdev Zala
Direction:
Approved
Assignee:
FeihuJiang
Definition:
Approved
Series goal:
None
Implementation:
Implemented
Milestone target:
None
Started by
Sahdev Zala
Completed by
Sahdev Zala

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