Added irr package on R (travis)
Added irr package on R (travis)

IsmailM/statsample,v0dro/statsample,v0dro/statsample,michaelphines/statsample,SciRuby/statsample,jaredpohl/statsample,v0dro/statsample,mikecmpbll/statsample,SciRuby/statsample,clbustos/statsample,michaelphines/statsample,mikecmpbll/statsample,IsmailM/statsample,jaredpohl/statsample,michaelphines/statsample,mikecmpbll/statsample,clbustos/statsample,IsmailM/statsample