Parameters for eatch suite

This pull request will allow you yo use parameters in the suite configuration.
Create a `api.suite.dist.yml` and ignore `api.suite.yml` in your version control.

Now everybody can have his own parameters.

Usage:
```yml
class_name: ApiGuy
modules:
    enabled: [PhpBrowser, REST, ApiHelper, Db]
    config:
        PhpBrowser:
            url: http://api.loc
        REST:
            url: http://api.loc
        Db:
            dsn:      'mysql:host=localhost;dbname=api'
            user:     user
            password: password
            dump:     tests/_data/dump.sql
            populate: true
            cleanup:  false

parameters:
    apiUrl:         http://api.loc
    key:            secret api key
    format:         JSON
```
I choose for the `*.suite.yml` files because this file is already developer specific. 

And in each test you can do the next to get the parameters:
```php
$parameters = $this->getParameters();
$apiUrl     = $parameters['apiUrl'];
```

Fixes: #453