# Returns the path from an FTP URI.
    #
    # RFC 1738 specifically states that the path for an FTP URI does not
    # include the / which separates the URI path from the URI host. Example:
    #
    #     ftp://ftp.example.com/pub/ruby 
    #
    # The above URI indicates that the client should connect to 
    # ftp.example.com then cd pub/ruby from the initial login directory.
    #
    # If you want to cd to an absolute directory, you must include an
    # escaped / (%2F) in the path. Example:
    #
    #     ftp://ftp.example.com/%2Fpub/ruby
    #
    # This method will then return "/pub/ruby"