reorg and cleanup, resource collection and widget, misc. fixes

[mlhenderson]

• Simplifying repo structure, reducing code/examples/files down to a set for the current use cases, legacy files/code will live in a separate branch
• Added a widget composed of standard Jupyter widgets and Plotly widgets to display different node and task resource info
• Added scripts for starting the worker and manager services
• Added status url for manager service
• Added default timeouts for client methods