Lazily create ol.defaultFeatureStyleFunction

Besides the slight performance benefit of not prerendering the default
circle style until we need to, this change also allows loading OL3
in browsers that don't support the canvas API (IE 7-8). If the circle
style is rendered on load, the lack of HTMLCanvasElement#getContext
causes IE 7-8 to bomb, regardless of if vector styles are used at all.
Check arguments passed to ol.geom.Polygon#setFlatCoordinates
Check arguments passed to ol.geom.MultiLineString#setFlatCoordinates
Check arguments passed to ol.geom.MultiPolygon#setFlatCoordinates
Add ol.geom.LineString#appendCoordinate
Add ol.geom.Polygon#appendLinearRing
Add ol.geom.Polygon#getLinearRing
Add ol.geom.MultiPoint#appendPoint
Construct individual points directly from flat coordinates
Add ol.geom.MultiPoint#getPoint
Construct individual line strings directly from flat coordinates
Add ol.geom.MultiLineString#getLineString
Add ol.geom.MultiLineString#appendLineString
Add test for ol.geom.MultiPolygon#getPolygons
Tidy up ol.geom.MultiPolygon#getPolygons
Add ol.geom.MultiPolygon#getPolygon
Add ol.geom.MultiPolygon#appendPolygon
Add possible values of layer for olx.source.MapQuestOptions
Don't use the regex module
Add documentation for ol.format.Feature public API methods intended to be inherited by subclasses.