Try Rails 4.2 beta
Workaround issue alexrothenberg/ammeter#42

Rails 4.2 has deprecated the `capture` method as it is not thread safe.
This shim worksaround the open issue on Ammeter which calls out to
`capture`.

I have no idea if this is thread safe or not.:grimacing: :unamused:
Removed ammeter-shim and upgraded to ammeter v1.1.1 as it defines `capture` now
Fix cukes to handle Rails 4.2 scaffold changes.

Rails 4.2 changed how the generated scaffold created views. It has
started capitalizing the model names in the view headers.
Run 1.8.7 and 2.1.2 first test edges first
Use patch until new gem is cut.
Merge pull request #1149 from rspec/try-rails-4-2-beta

Work toward Rails 4.2 beta support