Changes to input list markup

Add `listItemName` variable, from content, to pages to allow question-specific phrasing.

See example of how questions refer to the items in their lists as a 'feature' or a 'benefit', both of which come from the content:

![image](https://cloud.githubusercontent.com/assets/87140/4526214/51091262-4d5d-11e4-890b-e404b9bc3e2b.png)