updated documentation: * tile generation now specifies projection properties * improved documentation of binning levels
updated documentation:
* tile generation now specifies projection properties
* improved documentation of binning levels

unchartedsoftware/aperture-tiles,unchartedsoftware/aperture-tiles,unchartedsoftware/aperture-tiles,unchartedsoftware/aperture-tiles,unchartedsoftware/aperture-tiles