Add gem devise to login

Signed-off-by: Gustavo Toshi Komura <gtk10@c3sl.ufpr.br>
Change index page of aplication

Signed-off-by: Gustavo Toshi Komura <gtk10@c3sl.ufpr.br>
Execute "rails g devise:install"

Signed-off-by: Gustavo Toshi Komura <gtk10@c3sl.ufpr.br>
Add model user

Signed-off-by: Gustavo Toshi Komura <gtk10@c3sl.ufpr.br>
Complement of devise

Signed-off-by: Gustavo Toshi Komura <gtk10@c3sl.ufpr.br>