Sort lines in alphabetical order, CSSLint style!

For example:

Your extension sorts like this:

```
border-radius: 8px 8px 0 0;
border: 20px solid #000000;
```

But CSSLint expects this order:

```
border: 20px solid #000000;
border-radius: 8px 8px 0 0;
```

This is due to the dash, the code for sorting alphabetically is different for the two!
