Management interface using JMX

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We should provide CumulusRDF with managed beans in order to have monitorable 
data.

In this way we could use an existing client (e.g. JConsole) for  

- seeing how things are going during a massive insert
- seeing real-time performances in terms of queries / sec

- changing log level at runtime
- adjusting and tuning the store depending on the runtime context

Original issue reported on code.google.com by a.gazzarini@gmail.com on 19 Apr 2014 at 5:38