Merge branch 'master' into develop

* master:
  make loggerMapper a singleton
  edit default format
make handlerManager invisible
Merge branch 'feature/refactor_handler' into develop

* feature/refactor_handler:
  make handlerManager invisible
remove flag and pem params
Merge branch 'feature/simple_file_handler' into develop

* feature/simple_file_handler:
  remove flag and pem params
Merge branch 'develop'

* develop:
  remove flag and pem params
  make handlerManager invisible