Upgrade gin-gonic to latest master, fix compatibility issues

vendor/github.com/gin-gonic/gin/mode_test.go

@@ -0,0 +1,31 @@
+// Copyright 2014 Manu Martinez-Almeida.  All rights reserved.
+// Use of this source code is governed by a MIT style
+// license that can be found in the LICENSE file.
+
+package gin
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func init() {
+	SetMode(TestMode)
+}
+
+func TestSetMode(t *testing.T) {
+	SetMode(DebugMode)
+	assert.Equal(t, ginMode, debugCode)
+	assert.Equal(t, Mode(), DebugMode)
+
+	SetMode(ReleaseMode)
+	assert.Equal(t, ginMode, releaseCode)
+	assert.Equal(t, Mode(), ReleaseMode)
+
+	SetMode(TestMode)
+	assert.Equal(t, ginMode, testCode)
+	assert.Equal(t, Mode(), TestMode)
+
+	assert.Panics(t, func() { SetMode("unknown") })
+}