Merge branch 'backstage/gb/add-pipeline-bridge-presenter' into 'master'

Add pipeline bridge presenter

See merge request gitlab-org/gitlab-ce!26911

app/presenters/ci/bridge_presenter.rb

+# frozen_string_literal: true
+
+module Ci
+  class BridgePresenter < CommitStatusPresenter
+    def detailed_status
+      @detailed_status ||= subject.detailed_status(user)
+    end
+  end
+end

spec/presenters/ci/bridge_presenter_spec.rb

+require 'spec_helper'
+
+describe Ci::BridgePresenter do
+  set(:project) { create(:project) }
+  set(:pipeline) { create(:ci_pipeline, project: project) }
+  set(:bridge) { create(:ci_bridge, pipeline: pipeline, status: :failed) }
+
+  subject(:presenter) do
+    described_class.new(bridge)
+  end
+
+  it 'presents information about recoverable state' do
+    expect(presenter).to be_recoverable
+  end
+end