Expose rgba properties of Color

[stillwaiting]

Hi! First, thank you very much for all your hard work. I've used your wrapper for my key component (puzzle engine) in my pet project: gamified pomodoro-like timer puzzle25.com.

However, I badly needed these properties to check wether the mouse is over the puzzle or over some empty space, therefore added these. Wondering if this could go upstream as they are available in the JS version of paper.js.

Thanks.

[yoeluk]

No problems. Thanks for your PR! I'm wondering why in specific you need the var parameters? Wouldn't it be better to return a new colour via the copy or apply methods?
myColour.copy(red = ...)

[stillwaiting]

In paper.js I can do things like:

if (circle.fillColor.alpha > 0.5) {
    circle.fillColor.alpha = 0.1;  
}

so, this is kind of functionality I was missing. But I see you point, let me play with it some more. Thanks.

[stillwaiting]

Sorry for the long reply, hard week. Yep, you are right, I can always create the new object, so only read access is required. Amended. @yoeluk, would you please have a look?