Changes to specs to remove deprecated syntax

This pull request contains changes to various tests to replace deprecated Rspec syntax with the recommended form.

Most of the changes are switching from `be_false` or `be_true` to `be false` or `be true`.
There are some changes from `should` to `expect`  - mostly of the form 
`should have(n).items`  to  `expect(thing.size).to eq(n)`
These will still need to be fixed :smile: