Namespace not applied to all selector classes

Namespacing isn't working consistently. Here's a snippet of the class string when the namespace is set to `var css_browser_selector_ns = "cbs-";`:
`cbs-webkit chrome chrome31 cbs-mac mac10 mac10_8 cbs-js cbs-no-hidpi cbs-minw_980 cbs-maxw_1199 cbs-orientation_portrait ...`
