Add ol.geom.SimpleGeometry#getFirstCoordinate
Add ol.geom.SimpleGeometry#getLastCoordinate
Add ol.geom.Polygon#getInteriorPoint
Add ol.geom.MultiPolygon#getInteriorPoints
Merge pull request #1784 from twpayne/interior-point

Export getInteriorPoint(s) methods
Add ol.geom.flat.lineStringCoordinateAtM
Add ol.geom.LineString#getCoordinateAtM
Add tests for ol.geom.LineString#getCoordinateAtM
Use binary search in ol.geom.flat.lineStringCoordinateAtM
Use ol.geom.LineString#getCoordinateAtM in igc example
Merge pull request #1783 from twpayne/first-last-coordinate

Get first and last coordinate
Merge pull request #1759 from twpayne/interpolate-m

Interpolate-M