Force some permalink structures to avoid strange main site issues

We should be able to enforce a structure of year/month/day/post-name
across the University, as well as use common prefixes for category
and tag. If a special scenario comes up, we can deal with it on the
theme or plugin level, or revisit this approach
Filter the global submenu to remove options-permalink for all users
Merge pull request #187 from washingtonstateuniversity/feature/last-updated

[PR] Force permalink prefixes for posts, categories, and tags