Registering Transaction Event Handlers in neo4j
===

I'm currently using Spring Data with Neo4j and have subclassed the `SpringRestGraphDatabase` to allow the registration of specific transaction event handlers. 

I call the `registerTransactionEventHandler` method to do so. Unfortunately I always get the following exception:

    Caused by: java.lang.UnsupportedOperationException: null
    	at org.neo4j.rest.graphdb.AbstractRemoteDatabase.registerTransactionEventHandler(AbstractRemoteDatabase.java:52) ~[neo4j-rest-graphdb-1.6.jar:1.6]
    	at org.neo4j.rest.graphdb.RestGraphDatabase.registerTransactionEventHandler(RestGraphDatabase.java:28) ~[neo4j-rest-graphdb-1.6.jar:1.6]

By looking closely at the AbstractRemote I see that it always throws an exception:

    public <T> TransactionEventHandler<T> registerTransactionEventHandler( TransactionEventHandler<T> tTransactionEventHandler ) {
        throw new UnsupportedOperationException();
    }

The `RestGraphDatabase` doesn't provide an implementation for the register method hence the exception. I'm not sure what alternatives to use, especially as I'm extending `SpringRestGraphDatabase`.

Is there a cleaner alternative?

(I'm using v2.1.0.M1)
