Do not combine css properties

To stop underlining links in Outlook web app you have to set the following rule:

```
a {
text-decoration: none !important;
text-decoration: none;
}
```

What i get after running inline-css plugin is:
``
I think this plugin should not be so smart and should inline my css as it is leaving both rules in same order.

It would be great if you will add such option to API or point me at module which is responsible for combining css properties.