ADDED link to ecosio.com web page and ecosio blog which are both built using Middleman
Merge branch 'master' of https://github.com/middleman/middleman-guides

# By Chris Slowik
# Via Thomas Reynolds (2) and Chris Slowik (1)
* 'master' of https://github.com/middleman/middleman-guides:
  Added Simple.com to "Sites" section
  Added the Simple.com blog
Merge pull request #333 from ecosio/ecosio-addedNewSite

Ecosio added new site