Use a std::function callback rather then std::cout to log data #19

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bamkrs wants to merge 3 commits intopistacheio:masterfrom bamkrs:master

Commits on Oct 24, 2016

Use a std::function Callback rather then std::cout to log data from pistache.
Benedikt-Alexander Mokroß
committed
Hardened Log-Callback
Benedikt-Alexander Mokroß
committed
Moved Declaration to if-block, too
Benedikt-Alexander Mokroß
committed