Cosmetic changes

Some cosmetic changes. More changes will be made in the future but this is a good stopping point for now.
The logo.png was added but we don't do anything with it yet. I left it in because we probably will eventually.

Modal change (big close and big X):
![largebutton](https://cloud.githubusercontent.com/assets/2153070/2745729/30cde364-c73a-11e3-93d1-f4299433c59d.PNG)

Logged out (should show this without flicker):
![loggedout](https://cloud.githubusercontent.com/assets/2153070/2745733/400388b6-c73a-11e3-83eb-c18760833290.PNG)

Logged in:
![loggedin](https://cloud.githubusercontent.com/assets/2153070/2745735/48518b26-c73a-11e3-8c36-79c7085b8a61.PNG)