adds bower.json and update readme

Hey, thanks for this library... I really like it!..

I added a bower.json file in the PR, so the repo can be used via bower.

I also register it in the bower registry. 

```shell
bower info csstyle
bower csstyle#*                 cached git://github.com/geddski/csstyle.git#1.1.0
bower csstyle#*               validate 1.1.0 against git://github.com/geddski/csstyle.git#*

{
  name: 'csstyle',
  homepage: 'https://github.com/geddski/csstyle',
  version: '1.1.0'
}

Available versions:
  - 1.1.0
  - 1.0.1
You can request info for a specific version with 'bower info csstyle#<version>'
```



(You can delete it from the registry if you don't like that)