Create user login and signup pages

[dvidsilva]

Use express-passport-local to allow users to create accounts.

There are some guides here:
https://scotch.io/tutorials/easy-node-authentication-setup-and-local

But anything works.

The urls can be:

/user/login
/user/signup

Steps are roughly like:

• Create a User model
• Setup express passport
• Create the views for login and signup
• Take the users when they're logged in to users/profile
• Restrict the profile page to users who are not admins
• Add buttons for login and signup to the homepage
• Include roles in the user model, possible roles are [standard, admin, superadmin, chef]
• Create the serializers for the users, so that the role can be accessed in controllers

[dvidsilva]

@jideokus will be working on this.