Guard::Plugin::Hooker

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Guard has a hook mechanism that allows you to insert callbacks for
individual Guard plugins.
By default, each of the Guard plugin instance methods has a "_begin" and
an "_end" hook.
For example, the Guard::Plugin#start method has a :start_begin hook that
is runs immediately before Guard::Plugin#start, and a :start_end hook
that runs immediately after Guard::Plugin#start.

Read more about [hooks and callbacks on the
wiki](https://github.com/guard/guard/wiki/Hooks-and-callbacks).
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