Install tests
Install tests

Summary:
Install tests if they're built
Closes https://github.com/caffe2/caffe2/pull/94

Reviewed By: bwasti

Differential Revision: D4437950

Pulled By: Yangqing

fbshipit-source-id: 21204bd25a93a47e3e66378251e55fcfae6af7cf

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