4.0.0-RC

This is a BC breaking major

Please see Wiki for version map.

Main changes in API

• DB only queue (removed PID file solution and deprecations)
• All run() methods are now void. Exceptions must be used for the error case.

Improvements

• All configs are now defaulting to sane and secure values. Easier to start with the plugin.
• Interface contracting also for add() method.
• No more autoloading configs from a file, you need to manually do that from your application.
• A provided QueueException can be used for exceptions without stack trace.
• Add bake command to generate a Queue task as well as its test case.