add missing travis.yml
add missing travis.yml

weikang9009/pysal,hasecbinusr/pysal,pedrovma/pysal,spreg-git/pysal,lixun910/pysal,darribas/pysal,TaylorOshan/pysal,hasecbinusr/pysal,chhao91/pysal,badjr/pysal,nathania/pysal,ljwolf/pysal_core,lanselin/pysal,lixun910/pysal,pysal/pysal,pastephens/pysal,sjsrey/pysal_core,lixun910/pysal,ljwolf/pysal_core,sjsrey/pysal_core,pastephens/pysal,schmidtc/pysal,badjr/pysal,nathania/pysal,ljwolf/pysal,pastephens/pysal,dfolch/pysal,TaylorOshan/pysal,dfolch/pysal,schmidtc/pysal,ljwolf/pysal_core,jlaura/pysal,ljwolf/pysal,sjsrey/pysal,darribas/pysal,chhao91/pysal,sjsrey/pysal_core,TaylorOshan/pysal,jlaura/pysal,hasecbinusr/pysal,spreg-git/pysal,jlaura/pysal,ljwolf/pysal