Log Message:
Update ruby-hashery to 2.1.1.

## 2.1.1 / 2013-08-21

This minor release clarifies the licensing. The entire library is now
distributed under the BSD-2-Clause license, also known as the FreeBSD
license. In addition this release provides a bug fix for flattening
arrays that contain an OpenCascade object.

Changes:

* Clarify licensing.
* Fix #flatten on Arrays that contain an OpenCascade.