#1250 delegate String.unescapeHTML to jQuery implementation. fixes #1250

Please check if it's acceptable.

before
![screenshot from 2014-05-28 12 36 18](https://cloud.githubusercontent.com/assets/1520602/3107348/28a0cf4e-e684-11e3-8464-74985f0a4c45.png)

after
![screenshot from 2014-05-28 18 11 55](https://cloud.githubusercontent.com/assets/1520602/3107347/28700f58-e684-11e3-8e5f-5b3556f7daa7.png)