MINIFI-368 exclude hidden files when scanning for src files
MINIFI-368 exclude hidden files when scanning for src files

This closes #125.

Signed-off-by: Aldrin Piri <8746015474cd01110181ed51735247560fd08de4@apache.org>

kevdoran/nifi-minifi-cpp,apiri/nifi-minifi-cpp,kevdoran/nifi-minifi-cpp,minifirocks/nifi-minifi-cpp,dtrodrigues/nifi-minifi-cpp,NiFiLocal/nifi-minifi-cpp,achristianson/nifi-minifi-cpp,minifirocks/nifi-minifi-cpp,apiri/nifi-minifi-cpp,benqiu2016/nifi-minifi-cpp,kevdoran/nifi-minifi-cpp,jdye64/nifi-minifi-cpp,dtrodrigues/nifi-minifi-cpp,phrocker/nifi-minifi-cpp,NiFiLocal/nifi-minifi-cpp,benqiu2016/nifi-minifi-cpp,phrocker/nifi-minifi-cpp,dtrodrigues/nifi-minifi-cpp,minifirocks/nifi-minifi-cpp,achristianson/nifi-minifi-cpp,dtrodrigues/nifi-minifi-cpp,apiri/nifi-minifi-cpp,achristianson/nifi-minifi-cpp,jdye64/nifi-minifi-cpp,phrocker/nifi-minifi-cpp,apiri/nifi-minifi-cpp,kevdoran/nifi-minifi-cpp,NiFiLocal/nifi-minifi-cpp,jdye64/nifi-minifi-cpp,achristianson/nifi-minifi-cpp,apiri/nifi-minifi-cpp,NiFiLocal/nifi-minifi-cpp,kevdoran/nifi-minifi-cpp,minifirocks/nifi-minifi-cpp,jdye64/nifi-minifi-cpp,jdye64/nifi-minifi-cpp,dtrodrigues/nifi-minifi-cpp,phrocker/nifi-minifi-cpp,phrocker/nifi-minifi-cpp,benqiu2016/nifi-minifi-cpp