Add support for custom easing

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Add in support for users to add in their own custom easing/step functions.

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HTML test

[choan.galvez]

John, I've modified fx.js to allow the custom easing in the effects + the callback for every step suggested at ​http://proj.jquery.com/dev/bugs/bug/26/

Using the animate function, the syntax is as follows

$('#someselector').animate( { left: 200 }, "slow", { easing: somefunction, step: someotherfunction);

You'll find the diff file and a HTML test at ​http://scriptia.net/temp/jquery/easing/

Easing functions follows the model described at ​http://www.robertpenner.com/easing/ in that they receive four parameters (moment in time, beginning value, total change, duration) an return one value.

While testing the simultaneous animation of more than one property, I've found a bug in jQuery.speed which I thing I've fixed by doing the oldComplete thing just one time in each call to animate.

Hope these descriptions make sense!

[john]

This is in 1.1.