Improved neo4j connector

[miratepuffin]

We need to implement a better neo4j connector, which takes any cypher queries and returns a raphtory graph. See below as an example:

We need to consider that Neo returns Nodes, Relationships and scala values - these are not typed, so we need to work out which is which. We will also need to ask from the user a mapping for node id's and any time values as Neo doesn't have a concept of primary key.