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/DatabaseController.spec.js

@@ -1,18 +0,0 @@
-'use strict';
-
-let DatabaseController = require('../src/Controllers/DatabaseController');
-let MongoStorageAdapter = require('../src/Adapters/Storage/Mongo/MongoStorageAdapter');
-
-describe('DatabaseController', () => {
-  it('can be constructed', done => {
-    let adapter = new MongoStorageAdapter({
-      uri: 'mongodb://localhost:27017/test',
-      collectionPrefix: 'test_',
-    });
-    let databaseController = new DatabaseController(adapter);
-    databaseController.connect().then(done, error => {
-      console.log('error', error.stack);
-      fail();
-    });
-  });
-});