added refresh button.
refresh button added at bottom.  when clicked, refreshes stop information and scrolls back to the top of the document.
refresh button displays before all stops are loading, so using the loading animation to cover it up.
Merge branch 'gh-pages' of https://github.com/c4hrva/hrt-bus-finder into refresh-button

Conflicts:
	css/busfinder.css
Merge pull request #107 from wbprice/refresh-button

Refresh button