Suppress Ruby warnings
Suppress Ruby warnings

```
$ ruby -cv features/step_definitions/application_steps.rb
ruby 2.3.1p112 (2016-04-26 revision 54768) [x86_64-linux]
features/step_definitions/application_steps.rb:6: warning: ambiguous first argument; put parentheses or a space even after `/' operator
features/step_definitions/application_steps.rb:10: warning: ambiguous first argument; put parentheses or a space even after `/' operator
features/step_definitions/application_steps.rb:22: warning: ambiguous first argument; put parentheses or a space even after `/' operator
Syntax OK
```

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