Migrate to new swagger docs generation (#18)

vendor/golang.org/x/net/webdav/file_go1.7.go

@@ -0,0 +1,16 @@
+// Copyright 2016 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build go1.7
+
+package webdav
+
+import (
+	"context"
+	"net/http"
+)
+
+func getContext(r *http.Request) context.Context {
+	return r.Context()
+}