openlayers/ol3 — pull request #2335 by elemoine (2014-07-11 09:57:38+00:00)
Title: Add tilePixelRatio option to ol.source.XYZ

This PR supersedes #2308. It squashes @klokan's commits into a single commit, and uses the `ol.proj.transformExtent` as suggested in a comment in #2308.

I'll merge this before gamma.2.