custom logger support

pulled in @geronimo-iia and @seratonik's error handling fixes, moved …

…to standard coding style

fixed typo when processing jobs thanks @seratonik

fix for aws-sdk memory leak

@rubenstolk's jshint fixes

added support for custom aws headers.

added http://talentooff.com.br/ to README.

expose knox for @rafagomes

fixed issue with profiler.

upgraded all package versions.