remove --threads parameter for travis
remove --threads parameter for travis

dnlkoch/shogun2,terrestris/shogun2,buehner/shogun2,dnlkoch/shogun2,ahennr/shogun2,ahennr/shogun2,terrestris/shogun2,dnlkoch/shogun2,ahennr/shogun2,buehner/shogun2,buehner/shogun2,terrestris/shogun2