Utilizing new client and overhauling Accumulator interface

Fixes #280
Fixes #281
Fixes #289

plugins/kafka_consumer/kafka_consumer.go

@@ -93,7 +93,7 @@ func emitMetrics(k *Kafka, acc plugins.Accumulator, metricConsumer <-chan []byte
 			}
 
 			for _, point := range points {
-				acc.AddFieldsWithTime(point.Name(), point.Fields(), point.Tags(), point.Time())
+				acc.AddFields(point.Name(), point.Fields(), point.Tags(), point.Time())
 			}
 		case <-timeout:
 			return nil

plugins/kafka_consumer/kafka_consumer_integration_test.go

@@ -50,5 +50,5 @@ func TestReadsMetricsFromKafka(t *testing.T) {
 		"direction": "in",
 		"region":    "us-west",
 	}, point.Tags)
-	assert.Equal(t, time.Unix(0, 1422568543702900257), point.Time)
+	assert.Equal(t, time.Unix(0, 1422568543702900257).Unix(), point.Time.Unix())
 }