Proposed fix for Pivotal Bug 84990272

cloudfilebrowser.js is incorrectly prefixing an extra "/" to the path of files being POST'ed for upload. This is a proposed fix.

Video illustrating filebrowser.io behavior before fix:
http://www.screencast.com/t/fi1ok48SlRFA

Video illustrating localhost running cloud-file-browser-nodejs after fix:
http://www.screencast.com/t/MlDdsYTmBw