add python27 to travis build
add python27 to travis build

hughperkins/DeepCL,hughperkins/DeepCL,MiniLight/DeepCL,MiniLight/DeepCL,MiniLight/DeepCL,MiniLight/DeepCL,hughperkins/DeepCL,MiniLight/DeepCL,hughperkins/DeepCL,hughperkins/DeepCL