- Refactor HTTP verbs; preparing for auto_paginate, which needs to look at the Link attribute in the headers.  Since the existing request verbs don't pass back an object with headers, add an intermediate method, http_response_for(), that does.
- Added "auto_paginate" to the array of valid options.
- Added auto_paginate methods in a new client_helpers.rb.
- Added pagination for "/users" API call.
- Added some tests for "/users" (along with the necessary stubs).
- Ignore the vendor directory (I run "bundle install --path vendor/bundle").
Now that pagination is working for "/users", replaced "get" with "paginate" everywhere that :per_pages is involved (tests still pass).
Seems like auto_paginate belongs in this list.