travis: run python unit tests
travis: run python unit tests

appleseedhq/appleseed,aiivashchenko/appleseed,glebmish/appleseed,aiivashchenko/appleseed,luisbarrancos/appleseed,glebmish/appleseed,Biart95/appleseed,aytekaman/appleseed,Vertexwahn/appleseed,luisbarrancos/appleseed,Vertexwahn/appleseed,aiivashchenko/appleseed,Vertexwahn/appleseed,est77/appleseed,Vertexwahn/appleseed,pjessesco/appleseed,glebmish/appleseed,est77/appleseed,luisbarrancos/appleseed,Biart95/appleseed,docwhite/appleseed,est77/appleseed,Biart95/appleseed,dictoon/appleseed,aiivashchenko/appleseed,Aakash1312/appleseed,pjessesco/appleseed,Aakash1312/appleseed,Vertexwahn/appleseed,dictoon/appleseed,pjessesco/appleseed,pjessesco/appleseed,docwhite/appleseed,dictoon/appleseed,glebmish/appleseed,appleseedhq/appleseed,gospodnetic/appleseed,Aakash1312/appleseed,appleseedhq/appleseed,gospodnetic/appleseed,Biart95/appleseed,gospodnetic/appleseed,est77/appleseed,aytekaman/appleseed,glebmish/appleseed,appleseedhq/appleseed,docwhite/appleseed,aiivashchenko/appleseed,gospodnetic/appleseed,luisbarrancos/appleseed,dictoon/appleseed,Aakash1312/appleseed,appleseedhq/appleseed,Aakash1312/appleseed,est77/appleseed,aytekaman/appleseed,gospodnetic/appleseed,luisbarrancos/appleseed,docwhite/appleseed,aytekaman/appleseed,aytekaman/appleseed,pjessesco/appleseed,dictoon/appleseed,docwhite/appleseed,Biart95/appleseed