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.
Merge pull request #2978 from ahocevar/mapquest-zoom

Fix zoom levels for the MapQuest Street layer
Support OGC srs urns without an EPSG database version
Merge pull request #2979 from bartvde/proj-urns

Support OGC srs urns without an EPSG database version
Export ol.source.TileVector#getFeatures in built mode
Use lineDash in ol.style.Circle's and ol.style.RegularShape's stroke
Merge pull request #2980 from pgiraud/tilevector_getfeatures

Export ol.source.TileVector#getFeatures in built mode
For stars, use radius1 and radius2 in ol.style.RegularShape
Merge pull request #2982 from bartvde/radius1

Allow radius1 as an alias for radius in ol.style.RegularShape
Merge pull request #2981 from bartvde/circle-linedash

Use lineDash in ol.style.Circle's and ol.style.RegularShape's stroke (r=@fredj,@elemoine)