Adding a HasAndBelongsToMany relationship to reproduce a Rails 4.1 bug
Fixing Rails 4.1 HasAndBelongsToMany behavior
Update deps.
Convert specs to RSpec 3.0.0.beta2 syntax with Transpec

This conversion is done by Transpec 1.10.4 with the following command:
    transpec -f

* 15 conversions
    from: obj.should
      to: expect(obj).to

* 7 conversions
    from: == expected
      to: eq(expected)

* 1 conversion
    from: obj.should_not
      to: expect(obj).not_to
Bump up version.