basic linear zoomPanTo without intermediary tile loading
initial fractional zoom implementation for grid layers
fractional zoom code clean up an fixes
round grid layer scaling transform
use offset when animating transform to avoid dividing by zero
working zoomPanTo implementation
clean up zoomPanTo
cleaner reset logic for GridLayer
fix some positioning bugs
simpler zoom anim calculations
add fromZoom arg to Map getZoomScale and getScaleZoom
fix GridLayer to not reset if tile zoom didn't change
fix zoomPan logic, cleaner code
implement pyramid animations (no tile removal yet)
adjust zoomPan options, add a debug page
manage tile pyramid levels; always animate tile fade
zoom to the nearest round zoom with pinch or dblclick
code cleanup; don't reload tile level that's already loaded