Allowed for posting of articles

A visitor to the site can add an article with a required title field and a URL and/or content field. Currently very basic (read: ugly) and can allow the posting of an "article" with only a title and no URL or content.
Saw a couple lines like this throughout.  Typically, we'll break these up and use the `do/end` syntax to make these more readable.  Just a style thing though.
```
let(:params) do
  {
    title:   'Wow. Such Read',
    url:     'http://example.com',
    content: 'Check it'
  }
end
```