Corrected logic for determinine line intersection (for cases when the coordinates do wrap around or are in reverse)
Moved coordinate conversions into coordinates module
Added function for computing zxy coordinates
Added OnDemand source that uses a cache for preloading tiles (useful for very large datasets)
Added generation of compressed db from HYG dataset
Only register debug routes when we are running on dev server
Removed no longer needed modules
Ignore library dirs that we copy from /lib to src folder (gae needs them there)
Use our new OnDemandSource

Limit view into a 120deg fov centered at 0,0