created sessions controller and associated files #12
Created the signin page and session actions #12
tests for signin failure #12
tests for signin success #12
created the signin form #12
finished sign in user #12
installed cucumber and associated files #12
wrote a sign in cucumber feature #12
implemented step definitions for the signin cucumber feature #12
fixes #12
Merge pull request #13 from samuelralak/feature/12-user-sign-in

Feature/12 user sign in