Updated default values handling to one liner

[git-kamesh]

No description provided.

[Jhoubert]

You code is breaking the normal behavior since is expecting a value, you're missing it, this is a working one-liner.

Suggested change

	grab = grab || function() {};
	release = release || function() {};
	snapping = snapping || function () { true; }
	rearrange = rearrange || function () { false; }
	spacing_x = typeof spacing_x == undefined ? 20 : spacing_x;
	spacing_y = typeof spacing_y == undefined ? 20 : spacing_y;
	grab = grab || function() {};
	release = release || function() {};
	snapping = snapping || function () {return true; }
	rearrange = rearrange || function () { return false; }
	spacing_x = !spacing_x ? 20 : spacing_x;
	spacing_y = !spacing_y ? 80: spacing_y;