Add ol.geom.Polygon#getLinearRingCount function
Document ol.geom.Polygon#getLinearRing function
Merge pull request #2534 from fredj/polygon-api

Document ol.geom.Polygon#getLinearRing function
Make tileSize a config option for ol.source.XYZ
Merge pull request #2681 from ahocevar/xyz-tilesize

Make tileSize a config option for ol.source.XYZ