bug #67 fix error exit code (xabbuh)

This PR was merged into the master branch.

Discussion
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fix error exit code

In case that the server could not start we should indicate the failure
with a non-zero exit code.

This addresses @stof's comment in #54 (comment).

Commits
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9acb162 fix error exit code

Author: fabpot

symfony/framework-bundle/3.3/Makefile

@@ -13,7 +13,7 @@ sf_console:
 
 serve_as_sf: sf_console
 	@test -f $(CONSOLE) && $(CONSOLE)|grep server:start > /dev/null || ${MAKE} serve_as_php
-	@$(CONSOLE) server:start || exit 0
+	@$(CONSOLE) server:start || exit 1
 
 	@printf "Quit the server with \033[32;49mbin/console server:stop.\033[39m\n"