Objects from the Class
A virtual Class: No objects may be created from it.Slots
This is an S3 list with dynamic slots at present.
	 
- id
 - URI: the unique URL for the document
  - published
 - POSIXt, POSIXct: date the document was published
  - updated
 - POSIXt, POSIXct:  the date when the document was last updated/modified
  - category
 - character: the type of the document, e.g. spreadsheet, presentation, document
  - title
 - character: the name of the document
  - content
 - character: gives the type and the URL for the document
  - alternate
 - character: gives the type and URL for the alternative location
      of this document.
  - self
 - character vector: rel, type and href giving the 
  URL for the document
  - edit
 - character vector: rel, type and href giving the 
  URL for editing the document
  - edit-media
 - character vector: rel, type and href elements.
  - author
 - named character vector: gives the author's name and email address as 
   the name
  - feedLink
 - character vector: rel and href givng the general link for the document.
  - http://schemas.google.com/spreadsheets/2006\#worksheetsfeed
 - URL: only for spreadsheets. This is the URL for the feed for the accessing the worksheets within the spreadsheet
  
 Extends
Class "oldClass", directly.Methods
[<-  and $<- allow one to set meta data such as the title of a document
  on the Google server (i.e. not locally) rename is a generic with methods for documents that allows  one to easily
  set the title of a document/folder. names on a GoogleFolder gives the titles of the documents contained in that 
  folder.