Possible to create invalid dates with accessors about lubridate HOT 5 CLOSED

Should warn when that happens, but otherwise go backwards in time until you hit a real date.

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In documentation need to point out (with examples) that (a + b) - b != a and (a + b) + b != a + (b + b)

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done. Issue with warnings:

Warns when adding or using update. Does not warn when directly setting (will automatically make the fix). This method works by using
lubridate.warn <<- TRUE
Other methods would duplicate warning messages since adding uses update() in a way that generates warnings at each step of updating year, month, and mday.

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I removed this warning method. It now warns just once for ever application. It also defaults to the most recent real day.

To Do: put a + b examples in documentation

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this now rolls over to the real date that occurs when the false one would. e.g,

update(ymd(20080131), month = 2)
[1] "2008-03-02 UTC"

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