#19 VariableReference should implement Evaluatable

[Anil Saldhana]

A <Condition> in xacml 2.0 can contain a variable reference. Currently VariableReference extends Expression. So there is a CCE in Condition.evaluate method.

If the VariableReference class is made to implement Evaluatable, then all is fine.

[Roland Illig]

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Fixed in my local copy of sunxacml. Now I'm waiting for my commit-bit.