Allow AnalyticsFactory to be public/shared and injected in other services

[emmanuelballery]

Hi!

I updated the AnalyticsFactory to be able to inject it in my services/create multiple analytics without requiring the entire container and calling $container->get('gamp.analytics') each time. This way, I can simply create multiple Analytics like this :

use FourLabs\GampBundle\Service\AnalyticsFactory;

class Stats
{
    /** @var AnalyticsFactory */
    private $analyticsFactory;

    public function __construct(AnalyticsFactory $analyticsFactory)
    {
        $this->analyticsFactory = $analyticsFactory;
    }

    public function doSomething()
    {
        $analytics1 = $this->analyticsFactory->createAnalytics();
        // ...
        $analytics2 = $this->analyticsFactory->createAnalytics();
        // ...
    }
}

Could you take a look and tell me what you think.

Thanks!

[foaly-nr1]

Merged via #18.