Reversed values

To Whomever It May Concern,

Recently I have been working with this library on one of my projects. I wanted the ability to be able to reverse the values of a slider such that the max value is the leftmost value (topmost for a vertical slider) and the min value is the rightmost value (bottom value for a vertical slider). For example, here is how a regular horizontal slider looks (with the default max/min values):

![regularslider](https://f.cloud.github.com/assets/437318/802135/10fae804-edb8-11e2-811b-656ee4968057.png)

And with the 'reversed' option set as true, here is how the slider looks:

![sliderwithreversedenabled](https://f.cloud.github.com/assets/437318/802137/1f4974c0-edb8-11e2-8875-ee7c7aaf3651.png)

I think this would be a really useful feature for this library. Let me know what you think.

Thanks,
Rohit K