Add .travis.win.yml for windows build&test
Add .travis.win.yml for windows build&test

c-cube/lean,eigengrau/lean,UlrikBuchholtz/lean,leanprover-community/lean,fpvandoorn/lean2,fpvandoorn/lean,fpvandoorn/lean,UlrikBuchholtz/lean,dselsam/lean,soonhokong/lean-osx,fpvandoorn/lean,fpvandoorn/lean2,avigad/lean,javra/lean,soonhokong/lean,sp3ctum/lean,sp3ctum/lean,eigengrau/lean,fgdorais/lean,johoelzl/lean,Kha/lean,fgdorais/lean,c-cube/lean,johoelzl/lean,levnach/lean,soonhokong/lean-windows,codyroux/lean0.1,soonhokong/lean,digama0/lean,avigad/lean,digama0/lean,fgdorais/lean,soonhokong/lean-windows,UlrikBuchholtz/lean,soonhokong/lean-osx,soonhokong/lean,johoelzl/lean,c-cube/lean,fgdorais/lean,htzh/lean,soonhokong/lean-windows,UlrikBuchholtz/lean,dselsam/lean,avigad/lean,avigad/lean,Kha/lean,javra/lean,rlewis1988/lean,rlewis1988/lean,rlewis1988/lean,leanprover/lean,levnach/lean,Kha/lean,soonhokong/lean-windows,c-cube/lean,codyroux/lean0.1,sp3ctum/lean,codyroux/lean0.1,soonhokong/travis_test,soonhokong/lean,c-cube/lean,codyroux/lean0.1,sp3ctum/lean,johoelzl/lean,soonhokong/travis_test,fgdorais/lean,UlrikBuchholtz/lean,johoelzl/lean,dselsam/lean,leanprover/lean,htzh/lean,fpvandoorn/lean2,dselsam/lean,leanprover-community/lean,htzh/lean,javra/lean,levnach/lean,eigengrau/lean,fpvandoorn/lean,leanprover/lean,javra/lean,Kha/lean,soonhokong/travis_test,leodemoura/lean,digama0/lean,fpvandoorn/lean,soonhokong/lean-windows,leanprover-community/lean,fpvandoorn/lean2,fgdorais/lean,johoelzl/lean,dselsam/lean,leanprover/lean,avigad/lean,leanprover/lean,htzh/lean,fpvandoorn/lean,soonhokong/lean-osx,leodemoura/lean,leodemoura/lean,digama0/lean,dselsam/lean,sp3ctum/lean,leanprover-community/lean,leodemoura/lean,rlewis1988/lean,levnach/lean,leanprover-community/lean,soonhokong/lean-osx,eigengrau/lean,fpvandoorn/lean2,soonhokong/lean,leanprover-community/lean,Kha/lean,javra/lean,levnach/lean,rlewis1988/lean,Kha/lean,soonhokong/lean-osx,rlewis1988/lean,htzh/lean,leanprover/lean,soonhokong/travis_test,digama0/lean,avigad/lean,eigengrau/lean,leodemoura/lean,leodemoura/lean,digama0/lean