Steve Martinelli d7065ff54f Add documentation for implemented identity meters
Add a list of Identity events they can be metered, specifically:

- user authentication
- project create/update/delete
- role create/update/delete
- user create/update/delete
- group create/update/delete
- trust create/delete

Change-Id: I7a2f25c9e5b64e8f3a2ff986660e5ed531d955c3
2014-09-08 11:56:36 -04:00
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