IE8 has partial support for CSS3 selectors

When running the [test suite](http://tools.css3.info/selectors-test/test.html) on MSIE 8.0.7601.17514:
```
From the 41 selectors 20 have passed, 1 are buggy and 20 are unsupported (Passed 345 out of 574 tests)
```
Merge pull request #242 from ianjmacintosh/master

IE8 has partial support for CSS3 selectors