In peaches/:id, add ability to delete peach

[kkchu791]

It should delete the peach.

[kkchu791]

  describe 'destroy' do
    let!(:haiku) { FactoryGirl.create(:haiku, {"lines_attributes": {"0": {"content": "haiku line"}}} ) }
    it "should delete the haiku" do
      expect{ delete "/haikus/#{haiku.id}", format: :json }.to change{Haiku.count}.by(-1)
    end
  end

[kkchu791]

http://everydayrails.com/2012/04/24/testing-series-rspec-requests.html
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