Updated docs for the YUN.
Added new blog post for arduino YUN and updated YUN platform docs.
Updated blog post with example.
Rephrase section of the post.
Change author of blog post.
Updated title, date and YUN spelling to Yun.
Delete 2014-07-25-arduino-yun-support.html.haml
Merge pull request #19 from hybridgroup/yun-promotion

Yun promotion to it's own platform.