Add an mu-plugin to set template and stylesheet on demand

This is a hack, but it works. To be used, this file must be copied or moved to the wp-content/mu-plugins directory so that it can alter the requested stylesheet and template as the page loads.

Unfortunately, these are set so early in the process that it's seemingly impossible to hook in any later.
Add a plugin header for friendlier admin display
Filter the permalink when a piece of content is a fork.
Pass the fork's permalink back to the updated screen to modify previews
Improve updated template feedback in fork
Introduce an admin stylesheet for WSU Versions
Introduce a method to find a fork's original piece of content
Add information about the original content to a fork's versions display
Add admin CSS files
Additional styling to versions meta box
Cleanup of admin view for original content
Link to view and edit existing forks of an original content piece
Move some HTML display together for readability
Merge pull request #1 from washingtonstateuniversity/view-fork

[PR] Provide a way to view forked content under non-production templates.