Merge pull request #350 from presidentbeef/return_non_zero_exit_code_on_bad_path

User exit code of "1" when path is not a Rails app

bin/brakeman

@@ -75,4 +75,5 @@ begin
   end
 rescue Brakeman::Scanner::NoApplication => e
   $stderr.puts e.message
+  exit 1
 end