plugin XEP-0060: raise an `NotFound` exception instead of StanzaError in `subscribe`: `exceptions.NotFound` is now raised in stead of `item-not-found` `StanzaError` for consistency with `getItems` and because it's easier to catch (condition has to be checked when `StanzaError` is received). rel 372

You'll find install instructions in documentation (see doc/installation.rst).

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