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Initial release!
* ``before`` decorator - run a callback prior to the decorated function
* ``after`` decorator - run a callback after the decorated function
* ``instead`` decorator - run a callback instead of the decorated function
* ``decorate`` decorator - specify before, after, and/or instead callbacks
all at once
* ``construct_decorator`` function - create a reusable decorator with
before, after, and/or instead callbacks
* ``intercept`` decorator - wrap the decorated function in a try/except,
specifying a function with which to handle the exception and/or another
exception to re-raise
* ``log_call`` decorator - automatically log the decorated functions's
call signature and results