Add link to reserves.stanford.edu...

...on home page and on course reserves browse page.

Closes #886 

![crez-on-home-page](https://cloud.githubusercontent.com/assets/96776/4226451/89761a12-3937-11e4-84d2-4d911b389a0d.png)


![crez-masthead](https://cloud.githubusercontent.com/assets/96776/4226456/8e10bcd0-3937-11e4-9017-20b1c180a4ae.png)