added http://uandi.com/
Merge pull request #211 from uandi/master

Add http://uandi.com/
Adding Planio web site (built entirely in middleman)
Merge pull request #212 from yeah/patch-1

Adding Planio web site (built entirely in middleman)
add mailchimp, mandrill, and stevenosloan.com to list of sites using middleman
Add librario.de
Merge pull request #213 from tmaier/master

Add www.librario.de
Merge remote-tracking branch 'upstream/master' into ja