EventLoop: logs

Change-Id: I6dd895da1545990469ba095169fc14298ddb488a
Reviewed-on: http://gerrit.aldebaran.lan:8080/18724
Reviewed-by: cgestes <gestes@aldebaran-robotics.com>
Tested-by: cgestes <gestes@aldebaran-robotics.com>
add iocolor

linux only implementation.

do not output color is the stream is not a tty.

Change-Id: I45fa6aaea3a39aba30ed5e4b68ab9a928314d583
Reviewed-on: http://gerrit.aldebaran.lan:8080/18689
Tested-by: cgestes <gestes@aldebaran-robotics.com>
Reviewed-by: cgestes <gestes@aldebaran-robotics.com>
eventloop: threadsafe _get

Change-Id: I14b3a4764d65e36d9685f2b3dfec2bb9729edc46
Reviewed-on: http://gerrit.aldebaran.lan:8080/18723
Tested-by: gerrit
Reviewed-by: cgestes <gestes@aldebaran-robotics.com>
Tested-by: cgestes <gestes@aldebaran-robotics.com>