Dependency injection support. Resolves #1115

[splinter89]

I hope this will help with organizing of tests.

[DavertMik]

👍 looks cool. I will need to review it and maybe propose some changes. Personally I don't feel that DI is really needed, but this PR is so nicely done, so I can't be against it ) Good job.

The only bad thing I see: this will work for Cest classes only. Let's see If we can add Codeception\TestCase\Test support as well.

And as it is major change I will ask you to send this PR into master branch, so it will go into 2.1 release.
Thanks. Also, would you mind to contact me in Skype? davert.ua

[splinter89]

Thanks for the response!
The problem with Codeception\TestCase\Test is that PHPUnit_Framework_TestCase itself already has

public function __construct($name = null, array $data = array(), $dataName = '') {}

so it will break compatibility.