Adds happy path test
Adds devise
User can sign up with valid info (happy path) passes
Checks off criteria
Adds test for non-matching passwords
Prevents duplicate users
All scenarios pass, all criteria met
Fixes visibility of sign-in/out according to user status
Deletes redundant test files
Merge pull request #22 from lizvdk/user-authentication

User authentication
Fixes #15 and #16