authenticate user by hashed_email

[revgum]

Descriptive summary

The publications controller needs to "login" the associated user when the claim link is used. This bypasses the regular user authentication and logs in the user associated with claim_link passed in on the query parameters.

Expected behavior

In PublicationsController

• [x] Add skip_before_action :authenticate_user!, only: [:claim]
• [x] Add before_action :login_claim_link_user, only: [:claim]
• [x] Create login_claim_link_user method, find the user related to the AuthorPublication with the associated claim_link from params
• [x] Login the user found in the previous step (sign_in(@user))

[zhang4952]

fix by #176