Add support for full and brief email exports.

Closes #684 

Brief is plain-text which is parity with production. Full is an HTML email that renders the upper and lower metadata sections from the record view (removing any internal `link_to` links).  This is new behavior which will help the maintainability of this output much easier.

### New email form
![email-form](https://cloud.githubusercontent.com/assets/96776/4097432/f0766328-2fd4-11e4-8888-d84fe0a6cb33.png)


### Brief plain-text output
![9743424-brief](https://cloud.githubusercontent.com/assets/96776/4097427/dd95e5d0-2fd4-11e4-8443-ab42dcbde09b.png)

### Full HTML output (rendered in a browser)
![9743424-html](https://cloud.githubusercontent.com/assets/96776/4097430/e8d9fc10-2fd4-11e4-8bd4-5f06ee8f5a16.png)