Update to 0.951

 * Added CSRF token generation and check functions
 * Added CSRF token check to `user_register`, `post_form` and `post_comment` when you are calling those function via the HTTP api
 * Added validator class  
 * Added `filter` option in the ORM
 * Fixes in custom fields
 * Fixes in uploader 
 * Session is now destroyed after password reset
 * Password reset hash is changed on user email change
 * Fixes in search
 * Added custom fields to cart module admin
 * Many other big and small fixes