Tweak to Makefile install target - include version

This patch updates the Makefile install target to explicitly rebuild the
version_info package so it gets the latest version info for local,
default builds.

Makefile

@@ -273,7 +273,7 @@ _install: _deps _fmt
 	@printf "  ...installing rexray $(V_OS_ARCH)..."; \
 		cd $(BASEDIR); \
 		go clean -i $(VERSIONPKG); \
-		go install $(GOFLAGS) $(LDFLAGS) ./rexray/; \
+		go install $(GOFLAGS) $(LDFLAGS) ./version_info/ ./rexray/; \
 		$(PRINT_STATUS); \
 		if [ "$$EC" -eq "0" ]; then \
 			FILE=$(GOPATH)/bin/rexray; \