Make Retrying object callable and store stats #7
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Because it is useful to do a one-off retry of a function.
Additionally, it is useful to be able to get stats from the retrying object - how many attempts were made, what time did the retry start.
I also altered the decorator a bit so that every call to the wrapped function is not creating a brand new Retrying object. Might not save a whole lot unless functions are called rapidly but its still less work to create it up front.
I also added a couple tests.