fix(Selector): support Selector selection token

[ArgoZhang]

No description provided.

[trullock]

Thanks for the PR but you've modified every single line with whitespace changes.

Can you resubmit this with only changes to the affected lines, preserving the whitespace status quo please

[ArgoZhang]

@trullock updated

[trullock]

Thanks.

Can you add a css test that shows this works?

Add a method to the css bugs cs file, and add the input and expected css files to the test folders.

Should "just work" if you name everything properly

[ArgoZhang]

@trullock update the unit test for #383

[trullock]

Thanks, but its not testing the actual output is correct.

And can you add an additional, more complicated test, I'm not sure the change is going to cope with AND and OR selector rules