[Cassandra Wiki] Update of "ExtensibleAuth" by jeremyhanna

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The "ExtensibleAuth" page has been changed by jeremyhanna.
The comment on this change is: Adding a simple page for auth..
http://wiki.apache.org/cassandra/ExtensibleAuth

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New page:
== Cassandra's Extensible Authentication/Authorization ==

Cassandra uses an extensible authentication/authorization mechanism found in the org.apache.cassandra.auth Java source package.  It is configured in conf/storage-conf.xml (0.6.x) and conf/cassandra.yaml (0.7+).  There are two implementations built-in:

 * The default `AllowAllAuthenticator`/`AllowAllAuthority` approach is essentially pass-through. 
 * The `SimpleAuthenticator`/`SimpleAuthority` combination is property file based (using passwd.properties and access.properties respectively).  For more information on this approach, see the source in org.apache.cassandra.auth.

Both of the built-in options implement `IAuthenticator`/`IAuthority`.  Cassandra users needing more sophisticated auth functionality can implement these interfaces.