Merge pull request #2 from UNB-GPPMDS-2014/approval

Code of two iteration
Creating model CostumerService
Creating new file 'supplier.rb'
adding attributes
Merge branch 'list_costumer_service' of https://github.com/UNB-GPPMDS-2014/Proconsulta into list_costumer_service
new testes for the controller users, to test new methods (post, get, etc)
Creating test file of sessions controller
fixing names costumer->customer, customer_service migrate working fine
migrate suppliers done
Merge branch 'signin' of https://github.com/UNB-GPPMDS-2014/Proconsulta into signin
Creating test file of rating model
Creating some tests of rating model
Correcting name valeu_rating -> value_rating
Creating CRUD of class rating
Creating controller custome_service
Creating method show in custome_service_controller
Creating routes for customers_service
Changing subdirectories names from customer_service
Fixing index methods in customer_services_controller
Deleting wrong controller class