Add 'user friendly' datastore API.

service/datastore/serialize.go

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-package rawdatastore
+package datastore
 
 import (
         "bytes"
         "errors"
         "fmt"
         "sort"
         "time"
 
         "github.com/luci/gae/service/blobstore"
         "github.com/luci/luci-go/common/cmpbin"
@@ skipping 352 matching lines @@
         }
 }
 
 func recoverTo(err *error) {
         if r := recover(); r != nil {
                 if rerr := r.(parseError); rerr != nil {
                         *err = error(rerr)
                 }
         }
 }