Add e2e tests

vendor/github.com/gogo/protobuf/Makefile

@@ -83,6 +83,7 @@ regenerate:
 	make -C test/oneof regenerate
 	make -C test/oneof3 regenerate
 	make -C test/theproto3 regenerate
+	make -C test/mapdefaults regenerate
 	make -C test/mapsproto2 regenerate
 	make -C test/issue42order regenerate
 	make -C proto generate-test-pbs
@@ -109,14 +110,19 @@ regenerate:
 	make -C test/issue260 regenerate
 	make -C test/issue261 regenerate
 	make -C test/issue262 regenerate
+	make -C test/issue312 regenerate
 	make -C test/enumdecl regenerate
 	make -C test/typedecl_all regenerate
 	make -C test/enumdecl_all regenerate
+	make -C test/int64support regenerate
+	make -C test/issue322 regenerate
+	make -C test/issue330 regenerate
 	make gofmt
 
 tests:
 	go build ./test/enumprefix
 	go test ./...
+	(cd test/stdtypes && make test)
 
 vet:
 	go vet ./...
@@ -138,15 +144,16 @@ testall:
 	make tests
 
 bench:
+	go get golang.org/x/tools/cmd/benchcmp
 	(cd test/mixbench && go build .)
-	(cd test/mixbench && ./mixbench)
+	./test/mixbench/mixbench
 
 contributors:
 	git log --format='%aN <%aE>' | sort -fu > CONTRIBUTORS
 
 js:
-ifeq (go1.8, $(findstring go1.8, $(GO_VERSION)))
-	go get github.com/gopherjs/gopherjs
+ifeq (go1.9, $(findstring go1.9, $(GO_VERSION)))
+	go get -u github.com/gopherjs/gopherjs
 	gopherjs build github.com/gogo/protobuf/protoc-gen-gogo
 endif