Add travis webhook
Add travis webhook

Summary: Closes https://github.com/caffe2/caffe2/pull/1250

Differential Revision: D5898162

Pulled By: Yangqing

fbshipit-source-id: 06093e1c110c8645b876a13940552a39d3af1c43

Yangqing/caffe2,sf-wind/caffe2,davinwang/caffe2,davinwang/caffe2,sf-wind/caffe2,pietern/caffe2,pietern/caffe2,Yangqing/caffe2,Yangqing/caffe2,caffe2/caffe2,davinwang/caffe2,pietern/caffe2,sf-wind/caffe2,Yangqing/caffe2,davinwang/caffe2,Yangqing/caffe2,xzturn/caffe2,xzturn/caffe2,davinwang/caffe2,pietern/caffe2,xzturn/caffe2,xzturn/caffe2,sf-wind/caffe2,pietern/caffe2,sf-wind/caffe2,xzturn/caffe2