[R] Tool for update

[abunn]

> For what I understand you run this every time you use R on a Tuesday,
> which is not what I would want.

What's wrong with Tuesday? Indeed, it's not the ideal solution but has kept
me up-to-date. What has amazed me is that I think I've used R every Tuesday
(and other workdays) since I did that. So, it ends up working pretty well. I
will look forward to a cleaner implementation with 2.1

Much thanks, Andy