Created model for user database object.  Added bcrypt hash with salt to be run on password before save into database.  Added function to compare passwords to schema of user database object.
Created controller for authentication.
User authentication on backend working. Implement changing jade view depending on whether user is logged in or not.
Abstracted top nav bar into individual jade view to be included in layout jade.  Top nav bar will offer different links to logged in users.  Signup page will display error to user if user email already exists in database.
Error if passwords do not match on sign up.