Added ToDo Model and ToDos Collection.
Moved comparator up to the top of the Collections section.
Updated the stats-template markup to align with my custom variable names.
Updated namespacing on Collection and App Init.
Added top level App View.
Some events added to App View.
Changed Collections getCompleted and getRemaining to use Underscores where() instead of filter().
Added event and handler for Toggle All button.
Added the visible filter event listeners.
Added the render method for the App view.