Add support for batch record deletion

For example:

    const table = airtable.base('app123').table('My Table');
    await table.destroy(['rec123', 'rec456']);

gruntfile.js

@@ -22,6 +22,8 @@ module.exports = function(grunt) {
                     setTimeout: true,
                     jest: true,
                     describe: true,
+                    beforeAll: true,
+                    afterAll: true,
                     it: true,
                     expect: true,
                     Promise: true,

lib/table.js

@@ -1,5 +1,6 @@
 'use strict';
 
+var isArray = require('lodash/isArray');
 var isPlainObject = require('lodash/isPlainObject');
 var assign = require('lodash/assign');
 var forEach = require('lodash/forEach');
@@ -109,9 +110,25 @@ var Table = Class.extend({
             record.putUpdate(recordData, opts, done);
         }
     },
-    _destroyRecord: function(recordId, done) {
-        var record = new Record(this, recordId);
-        record.destroy(done);
+    _destroyRecord: function(recordIdsOrId, done) {
+        if (isArray(recordIdsOrId)) {
+            var that = this;
+            var queryParams = {records: recordIdsOrId};
+            this._base.runAction('delete', '/' + this._urlEncodedNameOrId(), queryParams, null, function (err, response, results) {
+                if (err) {
+                    done(err);
+                    return;
+                }
+
+                var records = map(results.records, function(recordJson) {
+                    return new Record(that, recordJson.id, null);
+                });
+                done(null, records);
+            });
+        } else {
+            var record = new Record(this, recordIdsOrId);
+            record.destroy(done);
+        }
     },
     _listRecords: function(limit, offset, opts, done) {
         var that = this;