Coalesce, initial parallelization work

• Parallelization of route segments processing
• Fix log
• Coalescing function to sumarize complex graphs
• Graph re-projection
• Fix absent wait times during bus stop processing
• Bidirectional synthetic networks

Synthetic graphs, layering

• Improved layering of multiple feeds correctly on top of one another
• Support synthetic new route addition, bidirectionality
• Bug fixes: directionality, better connector edges, node id naming, refactor of edge generators

Amending various import errors, adding sub Python 3.6 support

Dropped f-strings, updated imports, hooked up core files, methods.

Initial release

First pass on PyPI release.