Create activities index API

Will get all of the activities on the date supplied, or today's activities if no date is
included in the request.
Add activities example to the resources page

* Added Backbone plumbing to fetch the current day's activities
* New templates that allow the user to change the date to fetch activities for
* Added moment.js lib for formatting and working with Javascript Date objects
* Added bootstrap-datepicker lib (js/css) for providing a nice datepicker
* Fixed accounts_not_linked/not_logged_in boilerplate views to point to the right login url