Finish 'player equips armor' event, add 'player unequips armor'

Yay! Denizen is now the only plugin (that I know of) that correctly
utilizes every necessary event to create a custom armor un/equip event!
Take that, Bukkit!
Fix dispenser equip cancellation
Merge pull request #866 from Morphan1/master

Yay armor!
Merge pull request #865 from mcmonkey4eva/master

Pull request for various fixes 'n' such