Remove python 3.2 from travis builds
Remove python 3.2 from travis builds

As it doesn't support u'' prefix I think most projects have stopped
bothering to be compatible with it.

kirbyfan64/breathe,AnthonyTruchet/breathe,kirbyfan64/breathe,RR2DO2/breathe,kirbyfan64/breathe,kirbyfan64/breathe,AnthonyTruchet/breathe,RR2DO2/breathe,AnthonyTruchet/breathe,AnthonyTruchet/breathe