Fixed versioning

Versioning now is manually specified to avoid bug where the version was not being correctly reflected on pip install deployments

Fixed multi-threading bug and faster compute through caching of find_necessary_steps

We've introduced a cache to avoid computing find_necessary_steps multiple times during each inference call.

This has 2 benefits:

1. It reduces computation time of the compute call
2. It avoids a subtle multi-threading bug in networkx when accessing the graph from a high number of threads.

v1.2.0

1. Added set_execution_method('parallel') for execution of graphs in parallel

v1.1.0

Update setup.py

Networkx 2.0 compatibility

Minor Bug Fixes:

• Compatibility fix for networkx 2.0
• net.times now only stores timing info from the most recent run

Make plotting dependencies optional

Merge pull request #6 from yahoo/plot-optional

make plotting dependencies optional

v1.0.2: Merge pull request #5 from yahoo/remove-packaging-dep

Remove 'packaging' as dependency

Initial release of GraphKit

Merge pull request #3 from robwhess/travis-build

Travis build