TextSlider input

Now when you click, it doesn't resize the `TextSlider`. It should feel more like "in-place" editing.

The only issue is when there is just a single digit and you type a couple digits.. then it gets cut off till you hit enter. But in a typical use case. You would set the width of the `TextSlider` to something that fits your layout.

![text-slider](https://f.cloud.github.com/assets/378023/556855/64ca545a-c3e3-11e2-919b-1ecec329f316.png)