Animate dismissing tiddlers by moving them off to the left
Slide tiddler contents down and up depending on open and close
Test button construction and updates if followers are present
Don't use document.ready as this messes up state for testing

UI bindings moved to their own function which is called as part of init.

Also, keep the initialisation call out of the constructor so that the object can be created without worrying about side effects.

getTwiddlers is a user-facing function and is now called as such.