Polygon Simplification

RDP algorithm implemented

Signed-off-by: James Piggles <jack@homeflow.co.uk>
Merge branch 'master' of https://github.com/homeflow/Leaflet.draw

Signed-off-by: James Piggles <jack@homeflow.co.uk>

Conflicts:
	src/draw/handler/Draw.Freehand.js