Improving suite settings

I was trying to generate my custom `api` suite for testing my project API part (using your [manual](http://codeception.com/docs/10-WebServices)).
My project structure is described [here](https://github.com/Borales/yiitinializr-codeception) and my codeception-config for testing API is located [here](https://github.com/Borales/yiitinializr-codeception/blob/master/api/codeception.yml). As you can see, I have a separated sub-app `api`, so I've added `api` namespace to my config file.

I've tried to build my suites with `./codecept build --config=api/` and I got an exception `Suite  was not loaded`. 
Turns out that Codeception library cuts off a namespace part from the suite name.
Since Codeception allows to create suite with the name equals to a namespace - I've added a small improvement for such case, when a namespace and a suite name are equals.