Javascript refactoring

[joeellis]

Just a quick refactoring of the javascript in the overall application.html.erb template. Switched it to use the rails javascript helpers, put a very basic structure on javascript code, moved scripts to /javascripts instead of /js, small refactoring in the users index page to use a partial (which will be needed later for the continuous scrolling), and some gemfile updates (just run bundle install after pulling down the new code)

[mshwery]

would merge this pull request if i knew rails more comfortably. still has manual merge fixes.