Support for picking images.
Added image for README.md
Clean up poly selection
Updates for ISS viz.
Load mission data JSON, index by ID, and use that to find the image url of picked polygons
Updated README.md
Add compute rotaiton function
Add demo link to README.md
Fix demo link
Updated link
Improve README.md wording
Add a simplistic Node.js image proxy
Load the image for the selected polygon
Run rotation function
ISS view from to.
Download low-res images
Added loading image
Prepare data for grid.
Set current time when selecting polygons
Rename to EarthKAM Explorer