- Added most of the implementation for pooling entities, including a
parameter for selecting such behaviour from DAConstants.
- Fixed some docs here and there in Entity and DAConstants.
- Had to make Entity's 'id' private and mutable for pooling entities.
- Had to make EntityManager non-final for implementing
PooledEntityManager.
- Added getBoolOrDefault method in DAConstants for retrieving boolean
properties.
- Replaced Entity.id() calls with direct field access. No need for
accessors inside the framework.
- Removed irrelevant old javadoc pharagraph in Entity.
- 'disabled' bit set is initialized with the approximate live entities
size like the entities bag now.
- Fixed enforced limit on pooled entities in entity manager.
Merge pull request #5 from dustContributor/entitypool-exp

- Merging entity pool modification.