Daemonizer

[christianbrb]

In order to run the SP concurrently, we need to run our SPaaS services in the background.

The easiest way to manage this, is running them as well-behaved daemons.

Write a class which achieves the following:

• Detaches a process from its parent, turning it into a daemon using a double fork.
• Sets up a pidfile to track a daemon
• Allows idempotent starting of the daemon
• Allows stopping the daemon
• Manages redirection of stdout, stderr, stdin