MiniTest with fixtures setup. Added initial tests for User model. Added Password helpers for tests and fixtures.
TestPasswordHelper module was missing in previous commit
Initial Post model's tests. Added belongs_to association between users and posts. A post must have an associated user
Updated gems to latest versions. Initial tests for PostsController. Draft for tests requiring user's authentication.
Cleaned PostsController test. Refactored authentication test code into AuthHelpers
Fixed a bug in UsersService where currentUser didn't resolve the promise on success. Added tests for PostsController#index,create
Added UsersController tests