uber-go / zap / 1580

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Add APIs to support buffering

This is a breaking change that adds a `Sync` method to `zapcore.Core`. The
intention here is to expose `Sync` all the way up to the loggers themselves;
this lets implementations buffer I/O, since the end user can `Sync` at the end
of main.

(Of course, nothing can save users if they directly panic or os.Exit from a
different goroutine.)

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