Facet value ordering

Currently this sort order "config" is specified in the js file.  

After talking to Seb (who evidently doesn't have a github account), and with the view that this is an interim solution, I decided that it wasn't worth the effort of making this stuff truly configurable - but, I'm happy to discuss this.

The other options would be to:
* put the config in `Config.groovy`, but then, any change would still require a redeploy of either portal or chef;
* create a domain model (definitely don't think it's worth the effort for this)