DBController refactoring (#1228)

* Moves transform to MongoTransform

- Adds ACL query injection in MongoTransform

* Removes adaptiveCollection from DatabaseController

- All collections manipulations are now handled by a DBController
- Adds optional flags to configure an unsafe databaseController for direct
  access
- Adds ability to configure RestWrite with multiple writes
- Moves some transfirmations to MongoTransform as they output specific code

* Renames Unsafe to WithoutValidation

src/Adapters/Storage/Mongo/MongoStorageAdapter.js

@@ -1,6 +1,7 @@
 import MongoCollection                          from './MongoCollection';
 import MongoSchemaCollection                    from './MongoSchemaCollection';
 import {parse as parseUrl, format as formatUrl} from '../../../vendor/mongodbUrl';
+import * as transform                           from './MongoTransform';
 import _                                        from 'lodash';
 
 let mongodb = require('mongodb');
@@ -57,7 +58,7 @@ export class MongoStorageAdapter {
 
   schemaCollection() {
     return this.connect()
-      .then(() => this.adaptiveCollection(this._collectionPrefix + MongoSchemaCollectionName))
+      .then(() => this.adaptiveCollection(MongoSchemaCollectionName))
       .then(collection => new MongoSchemaCollection(collection));
   }
 
@@ -125,6 +126,10 @@ export class MongoStorageAdapter {
     .then(updateResult => this.schemaCollection())
     .then(schemaCollection => schemaCollection.updateSchema(className, schemaUpdate));
   }
+
+  get transform() {
+    return transform;
+  }
 }
 
 export default MongoStorageAdapter;