Suggest hoverability with account text.

#### What's this PR do?
Changes 'sign out' text to something that might indicate you could hover over it.
#### How should this be manually tested?
Load up the homepage when signed in.
#### What are the relevant tickets?
Fixes #470 
#### Screenshots (if appropriate)
![screen shot 2014-12-14 at 4 09 29 pm](https://cloud.githubusercontent.com/assets/3853/5429714/9dbee300-83ab-11e4-9846-084e75af1ec2.png)
![screen shot 2014-12-14 at 4 09 31 pm](https://cloud.githubusercontent.com/assets/3853/5429715/9dc05bd6-83ab-11e4-84e3-eb15eb51744e.png)

#### What gif best describes this PR or how it makes you feel?
![](http://whatgifs.com/wp-content/uploads/2012/07/funny-gifs-hoverboard.gif)