Show non-ascii characters without unicode escaping in result.

When I evaluated ruby string including non-ascii characters with this plugin, it show result as unicode escaped sequence. It seems that non-ascii characters in (:result res) are escaped.
![light_table](https://cloud.githubusercontent.com/assets/679040/3070974/846ae85a-e2b0-11e3-917f-3c521b37be03.png)

In irb, they are not escaped.
![akazah__ruby__8024](https://cloud.githubusercontent.com/assets/679040/3070964/5f6be1ee-e2b0-11e3-8b84-bff153ec2f1c.png)

As my idea,
this plugin may show them without escaping.
![light_table](https://cloud.githubusercontent.com/assets/679040/3070971/79326274-e2b0-11e3-842b-946dc223ccfd.png)