Add a real slider
I'd like to see a real slider component for a settings page in my app. This is what I mean:

![2013-04-02 11 33 00-cut](https://f.cloud.github.com/assets/510071/327536/8d70ecfe-9b78-11e2-8e01-a6749fa16ed7.png)

I don't need the icons on both sides, the currently selected value (in a specified min/max range) on the right side would help a lot, the "description" of the slider would go on top if needed.

For compatibility, a chevron would be added with a page where the user can enter the numeric value by themselves and maybe a more detailed description of what the slider is for.

Could this be implemented?
