Remove Events#off functionality that doesn't work
Remove Events#off functionality that doesn't work

Node's Events#removeAllListeners() method doesn't accept a function as
argument. It only accepts a string with an event name, so this
functionality would never work.

TinOo512/bookshelf,bookshelf/bookshelf,jadengore/bookshelf,rbong/bookshelf,jordansexton/bookshelf,rbong/bookshelf,jadengore/bookshelf,apla/bookshelf,seegno-forks/bookshelf,jordansexton/bookshelf,tgriesser/bookshelf,TinOo512/bookshelf,chrisbroome/bookshelf,jadengore/bookshelf,seegno-forks/bookshelf,apla/bookshelf,bookshelf/bookshelf,tgriesser/bookshelf,chrisbroome/bookshelf