Add ol.Map#getEventPixel
Add ol.Map#getEventCoordinate
Export ol.Map#getEventPixel
Export ol.Map#getEventCoordinate
Use getEventPixel in ol.MapBrowserEvent
Use getCoordinatePixel in ol.MapBrowserEvent
Export ol.Map#getViewport
Merge pull request #1129 from elemoine/eventcoord

Add ol.Map#getEventPixel and ol.Map#getEventCoordinate