Make ScheduleTask only store the task id
Deprecate unnecessary EquipmentUtil class

Deprecate the EquipmentUtil whose functionality is already available
through the bukkit api.
Rename Shape.getBoundingBox() to getAxisAlignedBoundingBox()
Add proper shutdown for MetricsLite

The integrated MetricsLite client now properly shuts down when the
plugin is disabled.
Deprecate the particle api

Mark the old particle api as deprecated because it will be replaced with
the new object system api.
Fix general minor issues
Add first part of object system api

Add the first and main part of the new object system api. Note that the
following features are not yet implemented:
* Silent firwork explosions
* Defining and spawning of particles
* Preset weighters
Update changelog