DATAGRAPH-423 Upgrade to Neo4j 2.0 GA release

* read transaction
* removal of reference node
* fixing tests
* updating dependencies

developer_notes.html

@@ -56,14 +56,11 @@ for (Node actor : actors.traverse(movie))
 
        <h4>Transactional: TX needed for write operations</h4>
        <pre>
-Transaction tx=graphDatabaseService.beginTx();
-try {
+try (Transaction tx=graphDatabaseService.beginTx()) {
   ... graph operations ...
   tx.success();
 } catch(Exception e) {
   tx.failure();
-} finally {
-  tx.finish();
 }
        </pre>
    </div>