The `type: :feature` is automatically detected by RSpec because these
tests are inside the `spec/features` folder. Using `feature` re-adds a
`type: :feature` to these files, which will result in a conflict when we
upgrade to Rails 5.1's system tests.
Because of this change, we also need to change `background` to `before`
or else these tests will fail.
Eventhough some of us sentimentals still like the syntax `to_not` the current trend is to move to the new syntax `not_to`.
In this commit we are updating the references of expectations that used `to_not` to `not_to`.
