Make the panning match the cursor
Allow zooming with scroll wheel
Enforce a minimum zoom that will keep the edges of the sphere from showing
	This probably just needs simple math with the aspect and/or the viewport's diagonal length.
Choose a pleasant initial zoom
Add data- attribute for minimum zoom
Add data- attribute for starting angle
Automatically create canvas for each marked <img> once it loads, and display:none the <img>
Add a class to the <canvas> for styling
Copy matrix funcs into code
Add licenses
Add instructions
Fix up code locality
Give the uniforms simpler names
Delete the defunct view matrix
Rename the model matrix as the view matrix, because that's really what it is.
Consider better names for the angle variables