Configuration new method create module

@davertMik i've made some refactoring of the ```Codeception\Configuration``` class and introduced new method, it also will be useful for ```DbPool``` module that will create new ```Db``` module per each node. So please review code and merge if everything is ok. 
I've tested this code on compiled phar, everything is ok. I also think that later i will provide unit-test for this method, but it can be merged for now without it.