Separating Responsibilities

[jugglinmike]

The mole hides itself when it is clicked, but the tasks of "hiding" and
"showing" seems like they should be controlled by the director. We wrote it
this way because we didn't have a director when we started, but now seems like
a good time to "refactor".

• mole.js
  • Define a prototype method called hide
  • Move the code that hides the mole from its "click" handler to the body
    of the new hide method
• directory.js
  • Invoke mole.hide() in each mole's onWhac method