DOC: use syntax highlighting on tutorials page.
DOC: use syntax highlighting on tutorials page.

tulip-control/tulip-control,pombredanne/nTLP,tulip-control/tulip-control,necozay/tulip-control,pombredanne/nTLP,necozay/tulip-control,tulip-control/tulip-control,necozay/tulip-control,necozay/tulip-control,tulip-control/tulip-control,necozay/tulip-control,pombredanne/nTLP