Refactor specificity

Don't use a value, but compare the 3 values in a seperate class. And
don't add the order to the specificity, only use it when the specificity
is equal.
Merge branch 'master' into specificity

Conflicts:
	CssToInlineStyles.php
Use regex for specificity

And added getValues() (for easier testing) and changed to compareTo, in
line with the CssSelector component.
Tweak match count
Cleanup
Merge branch 'specificity' of github.com:barryvdh/CssToInlineStyles into barryvdh-specificity

Conflicts:
	CssToInlineStyles.php
Merge branch 'barryvdh-specificity'