user sign up added, tests pass
existing user can login, tests pass
test updated to include existing email but invalid password
user logs in test checks for presence of sign out button
CRUD completed for users
user authenticationr required for goals and tasks controllers
Merge pull request #3 from kms617/add_users

Add users
Merge pull request #4 from kms617/user_sign_in

User sign in
change schema
user
Merge branch 'master' of github.com:kms617/toy
Merge branch 'master' into authentications
authentication added in form of admin and member role