Remove assets url to missing files
Update rails to 4.1.1 and others gems
Use state_machine gem from josemarluedke's github
Use font-icons-rails from josemarluedke's github with a fix
Remove scoped from project model

It was removed from rails on v4.1.0
Replace `shoulda` gem by `shoulda-matchers`

We were getting problems with `have_and_belong_to_many` on `shoulda` version.