remove use of /home/travis as recommended by travis documentation
remove use of /home/travis as recommended by travis documentation

ljwolf/pysal_core,jlaura/pysal,ljwolf/pysal,pastephens/pysal,weikang9009/pysal,lixun910/pysal,pysal/pysal,ljwolf/pysal,sjsrey/pysal_core,sjsrey/pysal,jlaura/pysal,jlaura/pysal,sjsrey/pysal_core,lanselin/pysal,hasecbinusr/pysal,TaylorOshan/pysal,pastephens/pysal,sjsrey/pysal_core,TaylorOshan/pysal,lixun910/pysal,hasecbinusr/pysal,ljwolf/pysal,schmidtc/pysal,pastephens/pysal,schmidtc/pysal,ljwolf/pysal_core,TaylorOshan/pysal,ljwolf/pysal_core,pedrovma/pysal,lixun910/pysal,hasecbinusr/pysal