add support for before/after hooks to support tracing outbound requests #95
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This change adds new options to the create*Client functions which allow before
and after hooks to be called for every request made by the client. This allows
for implementation of a tracing system around requests. It also allows a before
hook to add additional headers so that remote servers are provided tracing
information.
It replaces an earlier PR #77 which attempted to do the same
thing in a slightly different way.