Adding Behavior for Slider.js.

why is this humanize option mixed in with the modifier? it seems like an odd.. oh, wait. I see what's going on. Why not make these things work together like this?

```javascript
'operators': [
  { 'operate': ['pow', 2] }, //.operate('pow', 2)
  { 'operate': ['*', 3] },  // .operate('*', 3)
  { 'humanize': [{'decimalsLessThanBase': false}]}, // .humanize({'decimalsLessThanBase': false})
]
```
Now it's clear that you are calling number methods with their arguments. The way you have it, as I read the options it looks like you're passing humanize options to the number 2 or something.