Trimmed images for paths with gradients when path is greater than 800x600 px

[jrdiaz]

Hello, because a problem with canvg related to paths with gradients greater than 800x600 pixels (Canvg issue), when using img2svg to create images from those SVG's in a nodejs environment, the resulting images contains trimmed areas like this one

A workarround for this issue that I've used is to include clientWidth and clientHeight values in the options on instantiation and inject that information in a parentNode object at Workarround place

	if (options && options.clientWidth && options.clientHeight) {
		canvas.parentNode = {
			clientWidth : parseFloat(options.clientWidth),
			clientHeight : parseFloat(options.clientHeight)
		};
	}

This is a working workarround for the real issue but not a real fix for the problem.