Users can send pitch emails to journalists

Trello card: https://trello.com/c/rtMxACiY/56-send-pitch-emails

![email](https://cloud.githubusercontent.com/assets/4560985/5252379/231d97e4-796b-11e4-9ca1-a6e224eca4be.gif)

Boooo hash rockets. 

``` ruby
gem 'dotenv-rails', groups: [:development, :test]
```