Add a features api notebook (and a complex geojson file)

[angaither]

This notebook demonstrates the following:

• Create collection
• Upload Features to collection
• Validate Features and demonstrate simplification
• Use a Feature reference to search the Data API
• Use a Feature reference to Order data that was returned by the Search
• Use a Feature reference to create a subscription

[ischneider]

Came to agree with the large outputs - easy to lose context. Maybe anything longer than a "page" or 2 should be collapsed somehow?

Maybe just skip printing and add a note about response contents?