Neo4j 2.0 Rest transaction support

Hello,
I have implemented the neo4j 2.0 [REST transaction support](http://docs.neo4j.org/chunked/milestone/rest-api-transactional.html).

I also did the following:

* Cleaned up some failing tests due to changes in cypher.
* Upgraded all the dependencies.

I am a beginner Clojure programmer. So don't know if the code is good enough.

cheers