Update status embeds (#4742)

- Use statuses controller for embeds instead of stream entries controller
- Prefer /@:username/:id/embed URL for embeds
- Use /@:username as author_url in OEmbed
- Add follow link to embeds which opens web intent in new window
- Use redis cache in development
- Cache entire embed

spec/lib/status_finder_spec.rb

@@ -2,17 +2,17 @@
 
 require 'rails_helper'
 
-describe StreamEntryFinder do
+describe StatusFinder do
   include RoutingHelper
 
-  describe '#stream_entry' do
+  describe '#status' do
     context 'with a status url' do
       let(:status) { Fabricate(:status) }
       let(:url) { short_account_status_url(account_username: status.account.username, id: status.id) }
       subject { described_class.new(url) }
 
       it 'finds the stream entry' do
-        expect(subject.stream_entry).to eq(status.stream_entry)
+        expect(subject.status).to eq(status)
       end
 
       it 'raises an error if action is not :show' do
@@ -20,7 +20,7 @@ describe StreamEntryFinder do
         expect(recognized).to receive(:[]).with(:action).and_return(:create)
         expect(Rails.application.routes).to receive(:recognize_path).with(url).and_return(recognized)
 
-        expect { subject.stream_entry }.to raise_error(ActiveRecord::RecordNotFound)
+        expect { subject.status }.to raise_error(ActiveRecord::RecordNotFound)
       end
     end
 
@@ -30,7 +30,7 @@ describe StreamEntryFinder do
       subject { described_class.new(url) }
 
       it 'finds the stream entry' do
-        expect(subject.stream_entry).to eq(stream_entry)
+        expect(subject.status).to eq(stream_entry.status)
       end
     end
 
@@ -39,7 +39,7 @@ describe StreamEntryFinder do
       subject { described_class.new(url) }
 
       it 'raises an error' do
-        expect { subject.stream_entry }.to raise_error(ActiveRecord::RecordNotFound)
+        expect { subject.status }.to raise_error(ActiveRecord::RecordNotFound)
       end
     end
 
@@ -48,7 +48,7 @@ describe StreamEntryFinder do
       subject { described_class.new(url) }
 
       it 'raises an error' do
-        expect { subject.stream_entry }.to raise_error(ActiveRecord::RecordNotFound)
+        expect { subject.status }.to raise_error(ActiveRecord::RecordNotFound)
       end
     end
   end