Proposal: Add a configurable info/error logger #63
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For the sake of backwards compatibility, continue requiring DEBUG=apn to
log either of these.
For the sake of convenience, allow applications to manually override
these loggers on a per-Client instance basis.
A more fully-featured logger such as error/warn/info/debug might be
useful but overkill if the error conditions are rare in practice.
Related to #59
High volume uses of node-apn may benefit from logging errors but ignore
non-errors.
Related to #30