RSpec changes needed for Neo4j Orm Adapter

Some RSpec changes (bug fixes) in order to make the neo4j orm_adapter happy.

* Using :offset and :limit does not make sense without using :order in `find_all`
* RSpec 3.0 was released. Fixed one spec so it works both for RSpec 2.x and 3.x
Hello @andreasronge ! How is it going?

Question: do you think .to_a makes sense here? Shouldn't neo4j adapter return an array? Or, to change slightly the question, shouldn't neo4j adapter return the same as the others?