Grae edits

Hey Byonca, this pull request contains 3 commits:
 - First commit cleans up formatting and indentation so my linter is clean to work with :smile:
 - Second commit attaches the event handler to the <ul> rather than the individual <li>.  This is called event delegation (learn more here: http://learn.jquery.com/events/event-delegation/).  Note that $(this) now points at the <ul>, which means we'll have to select the <li> we're targeting some other way.
 - Third commit replaces $(this) (which, remember, is now the <ul> with $(event.target) which is the <li> we actually click on.  Huzza!  :+1: :smiley_cat: :congratulations:

Grae