Support options in GaussianWavelengthSlider

[samreid]

GaussianWavelengthSlider is created like so:

    // Create gaussian wavelength slider
    var gaussianSlider = new GaussianWavelengthSlider( model.filterWavelengthProperty, SLIDER_TRACK_WIDTH, SLIDER_TRACK_HEIGHT );
    gaussianSlider.bottom = this.layoutBounds.bottom - 20;
    gaussianSlider.right = wavelengthSliderDistance;

What do you think about adding an options parameter to the GaussianWavelengthConstructor so the layout can be passed in through the options?

[aaronsamuel137]

I think that's a great idea. Assigning to @samreid for review.

[samreid]

Looks good, thanks! Closing.