Gocats

Added
- remap_goterms function and sub-command to CLI.

Changed
- create_subgraphs Python API.
- categorize_dataset Python API.
- If you previously used create_subgraphs or categorize_dataset within a Python shell or Python script, you will need to update your code.
- Documentation in the guide and tutorial.

- Updated relationship_mapping in the GoParser to capture new "term_tracker_item" added to GO. Fixes issue 13: preventing newer versions of GO from being built within GOcats.

- Fixed an issue related to setting max field_size_limit for CSV and creating OverflowErrors on some systems.

- Hotfix: Fixed handling of edge case where a subgraph is attempted to be built on a set of seeded nodes that are exclusively leaves of the supergraph.
- Added CategoryNode object on SubGraph which replaces much of the functionality of the previous version's SubGraph.representative_node data member.
- CategoryNode contains a list called representative_nodes, which allows the subgraph to be rooted to multiple nodes if needed.

- Hotfix: Fixed issues in CD/CI scripts.

- Hotfix: Optimizing deployment options; adding bdist_wheel to setup script.