Remove extra calls to create moment object.

- self.datetime already is created as moment object, therefore there is no need to recreate it with a new moment object.
Fix check of day/night property.

- Used wrong hour based on military time.
Set helper properties for what time of day.

- Create properties to determine if it is a Day, Afternoon, or Night game.
- Use the new properties to set the game text.
Move Knockoutjs model definition out of document.ready call.
Add filtering to the GameView model.

- Add filtering computed function to determine what games to show.
- Update links to bind click events for filtering.
Move filter links to index view.

- Put site navigation where filter links were.
- Modify styling for filter-nav and create site-nav.