Added event handler to populate display name

Added an event handler to automatically populate the display name from
the user's original entry, which will allow users to see the original
friendlier name of an item in the content editor.  Added instructions in
the readme to remind people to update their config files to support this
Removed reference to "item:renamed" event

Removed the recommendation to add this as an item:renamed event, since
renaming the display name will require a separate method
Remove the actual project dll from /lib
Remove post build event that copied the .dll into /lib
Merge pull request #2 from savetherobot/master

Pull Request: Add optional event handler to populate display names, remove redundant copy of assembly