Dev email

Did a couple things here:
* generally styled email template to be more similar to our digest webpage (see below screenshot), referencing Mailchimp's email guides 
* used this Bootstrap Template for HTML Email thing: https://github.com/advancedrei/BootstrapForEmail
* @eeeschwartz did not yet drop in html boilerplate (http://htmlemailboilerplate.com/) because I wasn't sure how well it would play with BootstrapforEmail above and did not want to mess things up. would you mind taking a look at this whenever you get a chance?

![image](https://cloud.githubusercontent.com/assets/5245720/4346942/73176c42-4122-11e4-8529-4e4f81081806.png)