sequelize: add Sequelize.models property

sequelize/sequelize-tests.ts

@@ -1157,6 +1157,7 @@ new Sequelize( 'sequelize', null, null, {
 } );
 
 s.model( 'Project' );
+s.models['Project'];
 s.define( 'Project', {
     name : Sequelize.STRING
 } );

sequelize/sequelize.d.ts

@@ -5395,6 +5395,9 @@ declare module "sequelize" {
         }
 
         interface QueryOptionsTransactionRequired { }
+        interface ModelsHashInterface {
+            [name: string]: Model<any, any>;
+        }
 
         /**
          * This is the main class, the entry point to sequelize. To use it, you just need to
@@ -5415,6 +5418,11 @@ declare module "sequelize" {
              */
             Sequelize: SequelizeStatic;
 
+            /**
+             * Defined models.
+             */
+            models: ModelsHashInterface;
+
             /**
              * Returns the specified dialect.
              */