Add autocorrect support for RSpec/ScatteredSetup

[ydah]

This PR adds autocorrect support for RSpec/ScatteredSetup

In #1611 . I'd like to add support for automatic correction that causes RSpec/Rails/TravelAround cop to triggerRSpec/ScatteredSetup. WDYT?

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Before submitting the PR make sure the following are checked:

• Feature branch is up-to-date with master (if not - rebase it).
• Squashed related commits together.
• Added tests.
• Updated documentation.
• Added an entry to the CHANGELOG.md if the new code introduces user-observable changes.
• The build (bundle exec rake) passes (be sure to run this locally, since it may produce updated documentation that you will need to commit).

[pirj]

Nice!
This is what teamwork is:

  before { foo }
  before { bar }
  after { zoo }
  before { baz }
  it { aaa }

  before do
    foo
    bar
    baz
  end

  after { zoo }

  it { aaa }

[pirj]

Thank you!