Add MHLD support

Closes #321 

Good Example: 492502

Also, browse Resource Type of Periodical or Microform and At the library can yield some MHLD data.

#### Record view
---
![mhld-record](https://cloud.githubusercontent.com/assets/96776/3548927/0971b7ae-08bd-11e4-9ca8-71e316f12b39.png)

#### Results view
---
![mhld-results](https://cloud.githubusercontent.com/assets/96776/3548929/0fcc8a8e-08bd-11e4-9c47-015026049f37.png)