Add no_code_generation and stop_on_failure to config

fixes issue #352

This adds the following options to `phpspec.yml'

```yaml
no_code_generation: true
stop_on_failure: true
```
Option? What would you suggest?
On 11 Aug 2014 17:49, "Christophe Coevoet" <notifications@github.com> wrote:

> In features/options/developer_chooses_stop_on_failure.feature:
>
> > +    And the class file "src/SkipOnFailure/SpecExample3/FirstFail.php" contains:
> > +      """
> > +      <?php
> > +
> > +      namespace SkipOnFailure\SpecExample3;
> > +
> > +      class FirstFail
> > +      {
> > +          public function getValue()
> > +          {
> > +              return 1;
> > +          }
> > +      }
> > +
> > +      """
> > +    When I run phpspec with the "stop-on-failure" argument
>
> it is not a command either (the command is run)
>
> —
> Reply to this email directly or view it on GitHub
> <https://github.com/phpspec/phpspec/pull/418/files#r16064776>.
>