Support library specific location names...

...(and add two new LAW locations).

From access services:
```
The Locked Stacks items at Green are located in the Media Center,
so we'd like to send users there instead of the Circulation desk.
So maybe: "Locked Stacks: ask at Media & Microtext Center"?
```

### Examples

#### Green custom location (9218804)
![9218804](https://cloud.githubusercontent.com/assets/96776/4342055/21c371f2-4040-11e4-8419-552995c9f266.png)

#### Music default location (5323323)
![5323323](https://cloud.githubusercontent.com/assets/96776/4342054/21c1f7aa-4040-11e4-91bf-75bceaef4876.png)