pin hashdiff version, and update nori version.
Network Resource Pools

- Adds support for editing properties of built-in dvSwitch network
  resource pools.
- Some properties (description, name) of the built-in pools are not
  able to be changed.
- No support for custom pools at this time as they use dynamically
  generated keys which results in duplicate custom pools being
  generated on subsequent calls to the resource.
Merge pull request #127 from nanliu/version

Pin hashdiff version, and update nori version.
Merge pull request #126 from dscherer/network_qos

Network Resource Pools
Add unimplemented uid feature.
Modify create lun to reduce scanning attempts.
Merge pull request #129 from nanliu/uid

Add unimplemented uid feature.
Merge pull request #128 from nanliu/rescan

Modify create lun to reduce scanning attempts.
Initial travis testing.
Add spec tests.
Add spec fixtures.
Merge pull request #131 from nanliu/travis

Add travis testing.
Cluster Affinity Rule Support

- Support for creating and deleting (sorry, no modification yet) of
  cluster affinity (and anti-affinity) rules.
Merge pull request #133 from dscherer/vc_affinity

Cluster Affinity Rule Support
Merge pull request #130 from vmware/development

Update master branch