Simple network resource

Network resource.  Seems to work for create, delete and list.

Change-Id: I4b50bb2304a13f6b92433baacd02ff6e68dc4b65
Full flavor CRUD

Flavor CRUD v2

To use the low level api for the resource:

    from openstack.compute.v2 import flavor
    resp = flavor.Flavor.get_data_by_id(sess, '102')

The resp will be a dictionary.

Change-Id: I3a835e4e7ea5dd6e62cdd91748589edf54c0dcf9
Minor fixes to examples

* Fix typo in authenticate
* Add comments to head command
* Fix name of head method
* Use find_resource_cls for lists

Change-Id: If4bb485088460151916e1d2b9b5fe80ad150dcff
Proper string formatting in exception messages

Change-Id: I59b5525b6c9f00fbfe56910baa904aa82dcead6c
Merge "Simple network resource"
Merge "Proper string formatting in exception messages"
Merge "Full flavor CRUD"