Import Crux Metacity theme and rename it to Quid

For some reason it was removed from Marco and never put in mate-themes. I imported it from the metacity tarball and it works well now. It actually looks like Crux again. The obligatory screen-shot below.
![screenshot-2](https://f.cloud.github.com/assets/3465730/1850461/b2898f2e-76d2-11e3-85be-51861a8e224b.png)