Update to last common bleve (#3986)

vendor/github.com/couchbase/vellum/vellum_nommap.go

@@ -0,0 +1,27 @@
+//  Copyright (c) 2017 Couchbase, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// 		http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// +build nommap
+
+package vellum
+
+import "io/ioutil"
+
+func open(path string) (*FST, error) {
+	data, err := ioutil.ReadFile(string)
+	if err != nil {
+		return nil, err
+	}
+	return new(data, nil)
+}