<commit_before>## Change Log

#### Version: 0.9.1-SNAPSHOT
- **MINOR BREAKING CHANGES**
  - EntitySystem constructor expects Aspect.Builder:
    - Implies existing classes have to be recompiled against this release.
	- Existing custom entity systems need to pass Aspect.Builder to EntitySystem.
  - EntitySystem no longer implements EntityObserver.

- New internal EntitySubscription and accompanying AspectSubscriptionManager
  resulting in cleaner and more flexible EntitySystems.
- Aspect split into Aspect and Aspect.Builder.
  - Simplified static method names, mirroring Aspect's old instance methods.

- **Fix**: Uninitialized worlds threw cryptic NPE when invoking #process.

#### Version: 0.9.0 - 2015-02-03
- **MINOR BREAKING CHANGES**
  - Entity instances should never be compared by reference equality; always do
    `entity1.equals(entity2)`.
  - It is no longer valid to add additional managers or systems to initialized worlds.

- MundaneWireException thrown by World#inject if class lacks @Wire.
  Previously, it silently failed to inject.<commit_msg>more changlogging<commit_after>## Change Log

#### Version: 0.9.1-SNAPSHOT
- **MINOR BREAKING CHANGES**
  - EntitySystem constructor expects Aspect.Builder:
    - Implies existing classes have to be recompiled against this release.
	- Existing custom entity systems need to pass Aspect.Builder to EntitySystem.
  - EntitySystem no longer implements EntityObserver.

- New internal EntitySubscription and accompanying AspectSubscriptionManager
  resulting in cleaner and more flexible EntitySystems.
- Aspect split into Aspect and Aspect.Builder.
  - Simplified static method names, mirroring Aspect's old instance methods.
- **Fix**: Uninitialized worlds threw cryptic NPE when invoking #process.
- **Fix**: `World#createFactory(Class<EntityFactory>)` was package local.

#### Version: 0.9.0 - 2015-02-03
- **MINOR BREAKING CHANGES**
  - Entity instances should never be compared by reference equality; always do
    `entity1.equals(entity2)`.
  - It is no longer valid to add additional managers or systems to initialized worlds.

- MundaneWireException thrown by World#inject if class lacks @Wire.
  Previously, it silently failed to inject.
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