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

spec/PushController.spec.js

@@ -184,7 +184,6 @@ describe('PushController', () => {
    }).then((result) => {
      done();
    }, (err) => {
-     console.error(err);
      fail("should not fail");
      done();
    });
@@ -233,7 +232,6 @@ describe('PushController', () => {
    }).then((result) => {
      done();
    }, (err) => {
-     console.error(err);
      fail("should not fail");
      done();
    });