Merge pull request #5 from ezyang/pr/init-submodules

Initialize submodules in build.

Author: soumith

jenkins/pytorch/build_nimbix.sh

@@ -184,6 +184,7 @@ git clone https://github.com/pytorch/$PROJECT --quiet
 cd $PROJECT
 git fetch --tags https://github.com/pytorch/$PROJECT +refs/pull/*:refs/remotes/origin/pr/* --quiet
 git checkout $GIT_BRANCH
+git submodule update --init --recursive
 
 if [ "$OS" == "OSX" ]; then
     export MACOSX_DEPLOYMENT_TARGET=10.9