Add riemann output

Closes #34

outputs/riemann/riemann_test.go

@@ -0,0 +1,27 @@
+package riemann
+
+import (
+	"testing"
+
+	"github.com/influxdb/telegraf/testutil"
+	"github.com/stretchr/testify/require"
+)
+
+func TestConnectAndWrite(t *testing.T) {
+	if testing.Short() {
+		t.Skip("Skipping integration test in short mode")
+	}
+
+	url := testutil.GetLocalHost() + ":5555"
+
+	r := &Riemann{
+		URL:       url,
+		Transport: "tcp",
+	}
+
+	err := r.Connect()
+	require.NoError(t, err)
+
+	err = r.Write(testutil.MockBatchPoints().Points())
+	require.NoError(t, err)
+}