add go proto ci

Author: yinshucheng

.travis.yml

@@ -17,4 +17,8 @@ before_script:
 # let's use protobuf
 script:
   - $HOME/protobuf/bin/protoc --java_out=./  ./core/*.proto ./api/*.proto
+  - $HOME/protobuf/bin/protoc --go_out=./  ./core/*.proto
+  - $HOME/protobuf/bin/protoc --go_out=./  ./api/*.proto
+  - $HOME/protobuf/bin/protoc --grpc-gateway_out=logtostderr=true:./  ./api/*.proto
+
   - ls -l