Update Documentation/Readme

[josephecombs]

Google's documentation for cloudprint is really old now. Their API playground does not feature it any longer, rather they have a ...minimal... simulation tool here

Also, using this gem before the point of having a refresh_token is impossible, and understanding the flow of obtaining a refresh_token is complicated. Martin Fowler wrote an article about this, and he was using a well-documented API!

[thegengen]

I agree with both statements. As for #2, I do intend to provide a more automated workflow up to the point of getting a refresh token. Unfortunately, I don't have much time to work on the CloudPrint gem.

If you feel this is something you'd like to tackle, I think I can provide some guidance for it.