Disable C++11 builds in travis matrix for now.
Disable C++11 builds in travis matrix for now.

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