Release 0.2.14

Add following properties to enhance ease of use.

• Add lun_list property for VNXStorageGroup which returns a list of
  VNXLun that was added to the storage group.
• Add hosts property for VNXStorageGroup which returns a list of
  VNXHost that was added to the storage group.
• Add lun_list property for VNXHost which contains all connected LUNs
  of the host.
• Add alu_hlu_map that returns the mapping between array LUN ID and host
  LUN ID.
• Add alu_ids property for VNXHost which returns the IDs of the array
  LUNs that attached to the host.
• Add hlu_ids property for VNXHost which returns the LUN IDs on the
  host.