Fix: Error "Illegal nesting: nesting within plain text is illegal." in haml example
Updates Plupload to version 1.5.7

http://www.plupload.com/punbb/viewtopic.php?id=3711
sets rails >= 3.1
Merge pull request #21 from matiaskorhonen/1.5.7

Updates Plupload to 1.5.7
Merge pull request #22 from lucasrenan/rails4

rails 4 compatibility
Merge pull request #12 from whitehat101/master

Fix: Invalid haml in example