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)

Can you reformat as:

``` ruby
mail(
  to: journalist_email,
  subject: subject,
  body: body,
  from: "#{user.full_name} <pitchfort@gmail.com>",
  reply_to: user.email
)
```