Leaflet/Leaflet — pull request #1400 by jfirebaugh (2013-02-16 00:30:15+00:00)
Title: Enable cleaner overriding of TileLayer#getTileUrl

Moved the called to _adjustTilePoint outside of getTileUrl, and moved the
call to _getZoomForUrl into _adjustTilePoint. This allows getTileUrl to use
x, y, z directly without any calls to private methods.