alternate registration/login methods (start with email / pw)

[therewasaguy]

Currently using Passport to handle authentication but we are only using the GitHub strategy. We should allow for other methods to sign up / login, starting with:

• a user entering their own username + password, and email address
• verify their email address ?
• allow user to reset their password

This involves a serverside implementation similar to this.

It also involves designing a modal/dialog or registration page for users.