Release Name: 0.6.0

Notes:
Updated to reflect changes to video detail page layout.


Changes:
- [shaper] renamed Video#yesterday_view_count to 
  Video#view_count_yesterday for consistency, and aliased to maintain
  backwards-compatibility.

- [shaper] Updated to reflect video detail page edits:
  + parse new metrics on email and embed count/rank for today and yesterday
  + correct parsing to accurately grab from new layout of rank and view 
    count for today and yesterday
  + turned Video#rank_delta into a method that returns the delta between
    yesterday and today's rank.

- [shaper] Updated hpricot usage for brevity: use Element#[] for referencing
  attributes and Element#% for slicing out elements where we know there
  can be only one.

- [shaper] Fixed typo in rdoc for VideoSearchResponse.

- [shaper] Optimized string building for URLs and the like.