Fixed Caffe2 version

Author: KleinYuan

src/setup.sh

@@ -4,7 +4,10 @@ brew install automake libtool
 echo "[Step2] git cloning Caffe2"
 git clone --recursive https://github.com/caffe2/caffe2.git
 
+echo "[Step2 - b] checkout to a stable version tags/v0.7.0-163-gebc17cc8"
+cd caffe2 && git checkout tags/v0.7.0-163-gebc17cc8
+
 echo "[Step3] build ios"
-cd caffe2 && ./scripts/build_ios.sh
+./scripts/build_ios.sh
 
-echo "[Tada!] Done"
+echo "[Tada!] Done"