Add User#name attribute, and capture from github.
Add other User attributes to factory.
Use users name for email body.
Add from address. Addresses #44.
Add reply_to functionality to UserMailer.
Test all aspects of generated mail.
Merge pull request #45 from rjackson/add_name_to_users

Add User#name, and use in UserMailer. Closes #44 and #43.