added a scrollup button to the about page that shows when event is in live mode
Merge branch 'content' of github.com:drewww/unhangout into content
Merge branch 'master' into content
Wire up scroll-up button, fix condition and style

 - Change CSS class name to "scroll-up", to maintain convention with css
   class names using "words-with-dashes" rather than "mixedCase".
 - Wire up clicks on .scroll-up to emulate clicks on #about-nav.
 - Show "This event has not yet started..." only when the event is not
   live.
 - Consolidate "#about-event .footer" and ".event-footer" styles into
   one, "#about-event .about-footer".  Make footer message bold and
   darker so that it is more visible.
 - Fix tests for changed .footer class name, and add tests for scroll-up
   button.
Fix footer style, add speed bump to test