Add policy to determine compression/encryption per message type

[eben-roux]

Currently compression and encryption is either on or off per endpoint. It may be useful to specify different algorithms per message type; or leave empty if no algorithm is applicable.

This may work more-or-less along the same lines as the routing:

<compression>
    <algorithm name="gzip">
        <add specification="StartsWith" value="Shuttle.Messages1" />
    </algorithm>
    <algorithm name="deflate">
        <add specification="TypeList" value="DoSomethingCommand" />
    </algorithm>
</compression>

The same would apply to encryption.

Perhaps an ICompressionPolicy would be useful with the DefaultCompressionPolicy making use of the application configuration as specified above.