Merge branch 'release/v2.1.0' into develop
Don't use cbegin and cend for string. Not supported by GCC 4.4
Bumped version to 2.1.0
Don't use constexpr: not supported by gcc44.
Remove corner case of Slices.NonOverlapAll test where size < nb_slices.
Merge remote-tracking branch 'github/develop' into develop
Bumped version to 2.1.1. Fix gtest bug with gcc 4.8.
Merge branch 'release/v2.1.1'