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