Quick fix for sign out overemphasis?

@ericmeltzer points out that "sign out" is the strongest link for signed-in users now. Here's a tiny change that might help a little?

![screen shot 2014-07-21 at 5 13 43 pm](https://cloud.githubusercontent.com/assets/134455/3650377/ed5cf7c4-111b-11e4-97ea-e6425ee4f4eb.png)

Current:

![screen shot 2014-07-21 at 5 13 07 pm](https://cloud.githubusercontent.com/assets/134455/3650362/da507264-111b-11e4-8467-694beb783fbc.png)