Create a "live results" page

[djmolny]

Requirements:

• Display a simplified version of Contest#show, without points scored, chapter numbers, judge info, etc.
  • Include the current time and the time of the last update
  • Number the competitors by rank, 1 through n
• Scroll the display "slowly" from top to bottom, then return rapidly to the top
• Implement an Ajax call to the server that indicates whether the contest results have been updated since the last query
  • If so, reload the page
  • Execute the Ajax call every time the scrolling logic returns to the top of the page