Merge remote-tracking branch 'origin/develop' into issue74
Folder upload support (for Chrome)

 - fixes #74
 - tested on Chrome 27 (on Mac)
Fix typo
Upgrading version to 3.5.3-dev
Merge branch 'issue74' of https://github.com/gyuchang/dropzone into develop
Cleaned up folder handling and added download files.
Upgrading version to 3.5.3 (Added folder upload.)
Merge tag 'v3.5.3'

Added folder upload.