Add starred view with cookie and url support

Notes:
+ Starred locations accessible via set cookie at: /starred.html
+ Starred locations accessible via url. Ex: /starred/12,13,23,42,51/
+ Add click event for any button with class="button-add-starred" which adds the button's value to the correct cookie string
+ Minor changes to the location.html Handlebars template and associated js to allow it to be reused for favorites

TODO:
+ remove a line in starred.js that sets the cookie to a static value on every page load
+ Add starred page share button click function. Stub in place for now.
+ Add history.js for back button. Back button statically links to /search.html for now. This would be a trivial change.