fixed the multi-line issue for criterion prompt, criterion option text,

Fixed the multi-line issue for criterion prompt, criterion option text, peer assessment feedback and self assessment feedback. tnl-814
Added this property to show the text on multilines when there is new line in text.

![screen shot 2014-11-19 at 5 27 00 pm](https://cloud.githubusercontent.com/assets/2994509/5139296/eea8f6a6-717d-11e4-820c-9d35cfe563ee.png)