Do not use routes resource but dedicated urls
Implement user finder to make login work
Minor code cleanup
Reset instant login token after successful login
Show correct login link in email
Add feature spec for successful login flow
Add feature specs for login flow
Make users table name configurable

This allows the user to define the name of their users table and uses it for adding the missing instant_login database columns and for accessing it during run time
Make success and failure redirect path configurable