Revert "re #186: Add UserInterface::hasRole and hasRoles"

This reverts commit b250e58.

code/libraries/koowa/libraries/user/interface.php

@@ -43,22 +43,6 @@ public function getName();
      */
     public function getRoles();
 
-    /**
-     * Checks if the user has a role.
-     *
-     * @param  mixed|array $roles A role name or an array containing role identifiers.
-     * @return bool True if the user has at least one of the provided roles, false otherwise.
-     */
-    public function hasRole($roles);
-
-    /**
-     * Checks if the user has a set of roles.
-     *
-     * @param  array $roles An array containing role identifiers.
-     * @return bool True if the user has all of the provided roles, false otherwise.
-     */
-    public function hasRoles($roles);
-
     /**
      * Returns the groups the user is part of
      *