Architecture beta

This initial release includes the Tracker and Adapter interfaces and a concrete implementation for each of them.
Effort is due on testing and documentation of the toolkit.

GraphStream beta

TrackerHub emits nodes and edges now.

• Added simple calls to TrackerHub and Tracker which (by default) connect and stream data to Gephi.

• Each tracker is registered with a TrackerHub, and 2 references are kept for each Tracker 👎

• Error handling is non-existent -- will crash if Gephi not configured properly during runtime.
• Lots of features to be added!