Ability to set default input values on any effect as an option

[brianchirls]

Every effect input has a default value, but it would be convenient to be able to override the defaults in case someone wants to make many nodes with the same value.

• Passed as an option to the Seriously constructor:

    var seriously = new Seriously({
        defaults: {
            blur: {
                amount: 0.5
            },
            tvglitch: {
                lineSync: 0,
                verticalSync: 0
            }
    });

• defaults method on the Seriously instance:

    seriously.defaults({
        color: {
            color: 'darkgrey',
            width: 960,
            height: 540
        },
        blend: {
            bottom: seriously.effect('color')
        }
    });

    // or...
    seriously.defaults('edge', {
        mode: 'frei-chan'
    });

Reset defaults to default defaults:

    seriously.defaults(null); // all effects, all fields
    seriously.defaults('edge', null); // just one effect, all fields

[brianchirls]

This is done for effects, but not for transforms. I'm not sure whether it makes sense for transforms.

Thoughts, anyone?

[brianchirls]

Implemented for transforms.