Add a user

  * User can get his/her location
    * Only updates if the coordinates are stale
      * Currently more than five minutes old
  * Can find and set its own coordinates
  * Has an ISS object
    * Displays whether the ISS is visible
    * Displays which direciton the ISS is from user

Issues:
  * API call to get location is asynchronous. After the call,
  the user coordinates are returned. However, the API call
  has not yet finished at that point, so the coordinates are
  always one getLocation call behind
  * This should not matter much, as the maximum time will likely
  be about 5 minutes
Move file to the pebble-js-app.js
Merge pull request #5 from hwhelchel/add-user

Add user