Revert "Change namespace qi::version to class qi::Version"

This reverts commit 654b63d1abcf64143780021e4b6901d2fe304142

Change-Id: I918d3f9f40f2d33a331211cae89b1e280d11e4ce
Reviewed-on: http://gerrit.aldebaran.lan/20885
Reviewed-by: llec <llec@aldebaran-robotics.com>
Tested-by: llec <llec@aldebaran-robotics.com>
add const qualifier on promise.future()

Change-Id: I64ca14947f442bddbd5a797712c62e86cd339807
Reviewed-on: http://gerrit.aldebaran.lan/20855
Reviewed-by: rchevalier <rchevalier@aldebaran-robotics.com>
Reviewed-by: mnottale <mnottale@aldebaran-robotics.com>
Tested-by: gerrit
Reviewed-by: cgestes <gestes@aldebaran-robotics.com>