Added FolderNotFound exception to handle new folder functions in utils.py
Added FolderNotFound exception to handle new folder functions in utils.py

pratikmallya/pyrax,naemono/pyrax,rackerlabs/heat-pyrax,ddaeschler/pyrax,emonty/pyos,rackspace/pyrax,briancurtin/pyrax,vikomall/pyrax,mandx/pyrax,sivel/pyrax,opsdisk/pyrax,0dataloss/pyrax,EdLeafe/pyrax,roelvv/pyrax