Add support for drawing paths in `IRenderContext`
http://msdn.microsoft.com/en-us/library/system.drawing.drawing2d.graphicspath(v=vs.110).aspx
http://www.w3.org/TR/SVG/paths.html
http://msdn.microsoft.com/en-us/library/system.windows.shapes.path.aspx
http://developer.android.com/reference/android/graphics/Path.html
https://developer.apple.com/library/ios/documentation/2ddrawing/conceptual/drawingprintingios/BezierPaths/BezierPaths.html
http://msdn.microsoft.com/en-us/library/system.drawing.drawing2d.graphicspath(v=vs.110).aspx
http://www.w3.org/TR/SVG/paths.html
http://msdn.microsoft.com/en-us/library/system.windows.shapes.path.aspx
http://developer.android.com/reference/android/graphics/Path.html
https://developer.apple.com/library/ios/documentation/2ddrawing/conceptual/drawingprintingios/BezierPaths/BezierPaths.html