Remove duplicate `length` function
Rename `length` -> `distanceOfPoints`
Remove `lineStringLength`

Instead use `OpenLayers.Geometry.LineString.getLength`
Extract geometry functions into separate "class"
Move `GeometryUtils` to own file
Use "named parameters" in `SpeedLimitLayer`
Store calculated distance in a variable
Merge pull request #315 from finnishtransportagency/speed_limit_layer_cleanup

Speed limit layer cleanup