Add a link to a reported comment in the admin panel

Fix "There is no link to the reported comment in the admin interface" from https://github.com/diaspora/diaspora/issues/4711
Okay so here is the test I wrote:
```
describe ReportHelper, :type => :helper do
  before do
    @comment = FactoryGirl.create(:comment)
    @post = @comment.post
  end

  describe "#report_content" do
    it "contains the link to the post" do
      expect(report_content(@post, 'post')).to include('href="/posts/' + post.id + '"')
    end
    it "contains an anchor to the comment" do 
      expect(report_content(@comment, 'comment')).to include('href="/posts/' + post.id + '#' + comment.id + '"')
    end
  end
end
```

But I get the errors 
``       undefined method `post_page_title' for #<RSpec::ExampleGroups::ReportHelper::ReportContent:0x000000095a3e40>``
``undefined method `comment_message' for #<RSpec::ExampleGroups::ReportHelper::ReportContent:0x0000000994d410>``

Those are the methods called by report_helper, how can I give access to them to rspec?