calling getItems() on ArrayType instance throws exception #122

...
types:
  Cats:
    type: object[]
    items:
      properties:
        name: string
...

foreach ($apiDef->getTypes() as $type) {
    var_dump($type->getItems());
}

Exception: No type found for name array 

    /**
     * Retrieves a type by name
     *
     * @param string $name Name of the Type to retrieve.
     *
     * @return \Raml\TypeInterface Returns Type matching given name if found.
     * @throws \Exception When no type is found.
     **/
    public function getTypeByName($name)
    {
        foreach ($this->collection as $type) {
            /** @var $type \Raml\TypeInterface */
            if ($type->getName() === $name) {
                return $type;
            }
        }
        throw new \Exception(sprintf('No type found for name %s, list: %s', var_export($name, true), var_export($this->collection, true)));
    }