Unique indexes (#1971)

* Add unique indexing

* Add unique indexing for username/email

* WIP

* Finish unique indexes

* Notes on how to upgrade to 2.3.0 safely

* index on unique-indexes: c454180 Revert "Log objects rather than JSON stringified objects (#1922)"

* reconfigure username/email tests

* Start dealing with test shittyness

* Remove tests for files that we are removing

* most tests passing

* fix failing test

* Make specific server config for tests async

* Fix more tests

* fix more tests

* Fix another test

* fix more tests

* Fix email validation

* move some stuff around

* Destroy server to ensure all connections are gone

* Fix broken cloud code

* Save callback to variable

* no need to delete non existant cloud

* undo

* Fix all tests where connections are left open after server closes.

* Fix issues caused by missing gridstore adapter

* Update guide for 2.3.0 and fix final tests

* use strict

* don't use features that won't work in node 4

* Fix syntax error

* Fix typos

* Add duplicate finding command

* Update 2.3.0.md

spec/RestQuery.spec.js

@@ -1,3 +1,4 @@
+'use strict'
 // These tests check the "find" functionality of the REST API.
 var auth = require('../src/Auth');
 var cache = require('../src/cache');
@@ -7,10 +8,8 @@ var rest = require('../src/rest');
 var querystring = require('querystring');
 var request = require('request');
 
-var DatabaseAdapter = require('../src/DatabaseAdapter');
-var database = DatabaseAdapter.getDatabaseConnection('test', 'test_');
-
 var config = new Config('test');
+let database = config.database;
 var nobody = auth.nobody(config);
 
 describe('rest query', () => {