Introduced App Kernel
Add commands using DIC
Added missing NNTP Command
Fixed PHPUnit
Merge pull request #30 from eluceo/dependency-injection

Adding Dependency injection container.
This is the first step of some.

Things done:

add DIC
commands as services
Things do do:

move services like Database or AMQP to DIC
use config from symfony and remove Config
remove config file constant and remove Constants.php

Thanks to @eluceo!