Overloaded the Unwind operator to accept a generic collection. This will allow creating or retrieving multiple nodes and relationships in a single query.
Clean up UNWIND helpers

* replace 'columnName' and 'alias' references with 'identity' for
  consistency with rest of API surface

* use auto-generated property name for the collection, rather than
  assuming the alias name
Add fluent query helper for USING INDEX
Add support for F# generated Tuples in Return function
Merge https://github.com/Readify/Neo4jClient