Docs updated

Fixed broken ovewrite option

Cleanup

0.4.0 (#2)

* Custom node key support added

* Relationship upload process updated to use tuple data and unwind.

* Dedupe Nodes and relationship dictionary input payloads added

* Upload now returns seconds to complete, nodes created, relationships created, and total properties set

* Params added to query generation

* Dedupe modified to CREATE new nodes if enabled

* Target neo4j database name option added

* Subprocessing functions moved to a utils file + nodes also using WITH + UNWIND statement

* Batch processing added

* Batch configuration from main upload function

* version updated 0.4.0

README update