So many activities...

* Add ability to use role-based author slugs
* Fix non-functioning upgrade routine
* Add install routine
* Various logic improvements
* Introduce ba_eas() as the one, true, Edit Author Slug
* Cache improvements
* Overall code cleanup
* Add display name as an option for auto-update

git-svn-id: https://plugins.svn.wordpress.org/edit-author-slug/trunk@853331 b8457f37-d9ea-0310-8a92-e5e31aec5664