Rakefile: exit on failing test

And the world can always use more snark. ;-)

Rakefile

@@ -12,7 +12,9 @@ desc 'Run Devise tests for all ORMs.'
 task :pre_commit do
   Dir[File.join(File.dirname(__FILE__), 'test', 'orm', '*.rb')].each do |file|
     orm = File.basename(file).split(".").first
-    system "rake test DEVISE_ORM=#{orm}"
+    # "Some day, my son, rake's inner wisdom will reveal itself.  Until then,
+    # take this `system` -- may its brute force protect you well."
+    exit 1 unless system "rake test DEVISE_ORM=#{orm}"
   end
 end