Added View block to show WIT articles

https://www.pivotaltracker.com/story/show/61483270

This creates a block to list WIT articles.
Articles are all in teaser view mode
The article that were published on the last published day will be expanded.
The other articles will just show title. When you click the article the rest of the teaser will show via Javascript.

To use this JavaScript expand functionality in other places just surround nodes in an element with the class "collapse-list".  See "ilr_theme.js"