openlayers/ol3 — pull request #2978 by ahocevar (2014-11-27 18:13:36+00:00)
Title: Fix zoom levels for the MapQuest Street layer

A typo in 65b8e0f91576e521606d906ecdfa9dffd2159dcb introduced this bug.
Before that, 18 zoom levels were used. Now we're using 19, which appears
to be available with full world coverage.