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
```
Well, including unrelated changes in your PR makes it harder to revisw (I spent some time trying to understand why this code changed before figuring there was no difference in the behavior). And the usage of the ``container`` property would make it harder to extract the container building (currently ``setupContainer`` and all its helper methods are not depending on the fact that the container ends up being stored in ``$this->container``)