Changed Travis to run different Pythons in parallel
Changed Travis to run different Pythons in parallel

GreenSteam/pep257,jayvdb/pep257,Nurdok/pep257,jmullan/pep257,PyCQA/pydocstyle,farmersez/pydocstyle,pombredanne/pep257,Nurdok/pydocstyle,tescalada/pydocstyle