Don't use Bytes until #125 is resolved

The other option was to change the Travis config to avoid 4.01,
but I suspect that the present change will be helpful to some developers.
Fixed Hashtbl size
Prise en compte de l'erreur "port ilegal"
Merge branch 'master' of https://github.com/VLanvin/GL_MPRI_2014
Use prime numbers for hashtbl size
Added available_positions
Merge pull request #133 from GL-MPRI-2014/generation

Generation