added tox to travis
added tox to travis

Yelp/fullerite,mikepea/fullerite,baris/fullerite,baris/fullerite,mikepea/fullerite,Yelp/fullerite,baris/fullerite,mikepea/fullerite,baris/fullerite,mikepea/fullerite,Yelp/fullerite,Yelp/fullerite