Send salmons and websub in background tasks.

lib/pleroma/web/salmon/salmon.ex

@@ -150,9 +150,11 @@ def publish(%{info: %{"keys" => keys}} = user, activity, poster) do
 
       remote_users(activity)
       |> Enum.each(fn(remote_user) ->
+        Task.start(fn ->
           Logger.debug(fn -> "sending salmon to #{remote_user.ap_id}" end)
           send_to_user(remote_user, feed, poster)
         end)
+      end)
     end
   end
 

lib/pleroma/web/websub/websub.ex

@@ -51,11 +51,13 @@ def publish(topic, user, activity) do
       signature = sign(sub.secret || "", response)
       Logger.debug(fn -> "Pushing to #{sub.callback}" end)
 
+      Task.start(fn ->
         @httpoison.post(sub.callback, response, [
               {"Content-Type", "application/atom+xml"},
               {"X-Hub-Signature", "sha1=#{signature}"}
             ])
       end)
+    end)
   end
 
   def sign(secret, doc) do