Feature/jobs

Initial draft for background jobs with php-resque. Example with printing single events is fully working.

Location of individual files certainly needs to be discussed. But it's a working demo at least.

You need to setup/install/configure:
- Redis
- PHP Extension PCNTL
- config/fresque.ini

To start a worker type:
sudo ./vendor/bin/fresque start -c ./config/fresque.ini