Hey look, navigation

Also, I created a login partial (sessions/login) that we can include
wherever we want.

With that, there was some minor style changes (there need to be more).

The navigation will be made better eventually, when we get the the more
advanced stuff, but for now, you can get to any model we have, which
means we can add in data manually right now.

On a side note, why is games pluralized everywhere? Actually, now that
I'm thinking about it more than considering it weird, it's because rails
pluralizes things...