Adds test for issue #64
Fixes potential problem when removing entities from PooledEngine
Finally fixes issue #64
Add test for #70 and Signal#countListeners method used by the test.
Fix #70; resets component operation handler when an Entity is
removed from an engine.
Fix ordering of arguments for test.
Update AUTHORS file.
Remove count method only used in test
Update "resetEntityCorrectly" test to loop over multiple entities.
Add removeAllListeners method to Signal
Update PooledEngine to correctly reset entity signals and
update test accordingly.
Merge pull request #72 from SgtCoDFish/master

Fixes #70: PooledEntity: entity not fully reset
Entity uses long for id
PooledEntity correctly sets its id to 0 on reset
Changed getIndex() to getId()
Adds getEntities() to IntervalIteratingSystems and IteratingSystem for issue #71
Fixes GWT compatibility issue #73
Fixes comment in entity id
Renames id to uuid
Ups version to 1.3.0 pre-release
Ups version to 1.3.1 post release
Fix #77 where attempt to remove a Component from an
already-reset PooledEntity would cause an IllegalArgumentException.
Merge pull request #79 from SgtCoDFish/master

Fixes crash when trying to remove an invalid component from a PooledEntity #77