Receive all responses from the Droonga Engine.

If there is only one response, receive() returns the first response. Otherwise it returns an array of all responses. Because the receiver receives only "Droonga message format" objects, we don't have to think about array responses.

lib/droonga/client/connection/droonga_protocol.rb

@@ -184,12 +184,16 @@ def receive(receiver, options)
             responses = []
             receiver.receive(receive_options) do |response|
               responses << response
+              if block_given?
+                yield(response)
+              end
             end
-            response = responses.first
-            if block_given?
-              yield(response)
-            else
-              response
+            unless block_given?
+              if responses.size > 1
+                responses
+              else
+                response
+              end
             end
           ensure
             receiver.close