Optimize filter methods in FeedManager a bit, use redis pipelining on merge/unmerge feed methods,

do not re-create a dynamic class on each feed push call, make sure redis-rb uses hiredis

app/lib/inline_rabl_scope.rb

@@ -0,0 +1,17 @@
+# frozen_string_literal: true
+
+class InlineRablScope
+  include RoutingHelper
+
+  def initialize(account)
+    @account = account
+  end
+
+  def current_user
+    @account.try(:user)
+  end
+
+  def current_account
+    @account
+  end
+end