Add a stop command

- Stop will set running to false, allowing for new commands to swap the
  buffers.  It stops any JQuery slide animations. Sadly it doesn't stop
  the CSS transtions, which complete but buffer so that if a second
  command (like to) happens durring a slide then the slide will run to
  completion and then the to will happen.

- Add .swp to gitignore for when Dave comes to his senses and uses a
  real editor.

-Beautify and minify