This is a bug in cordova-file plugin that has now been fixed in the v1.1.1dev.
If you are busting to try it out you could remove your file-transfer and file plugin and install the development (just remember to add release one back in when it's out).
cordova plugin rm org.apache.cordova.file-transfer
cordova plugin rm org.apache.cordova.file
cordova plugin add https://github.com/apache/cordova-plugin-file.git
cordova plugin add org.apache.cordova.file-transfer