[Bower] Dependency fix in component.json

**This fixes**
An error with the dependency to [require-css][].

running: 
```
bower install git://github.com/guybedford/require-less.git
```
would previously download [require-css][] to a folder named *css*. This is a problem because in the code you [require it](https://github.com/guybedford/require-less/blob/master/less-builder.js#L1) as *../require-css*.

I also shortened the dependency to just version since [require-css][] is in the bower registry... hope that's fine by you.

[require-css]: https://github.com/guybedford/require-css