Issues/3922 fix pending rspec tests

Fix pending rspecs for works and skins, and add some to test the pseud model. Down from 88 pending tests to 76.

https://code.google.com/p/otwarchive/issues/detail?id=3922
I think we definitely want to test box-shadow with multiple shadows, e.g. `box-shadow: 5px 5px 5px black, inset 0 0 0 1px #dadada;`, but we should be okay without having this also try multiple rules and multiple selectors.