Merge pull request #64 from Mephistofeles/master

Refresh entity before the next update
Update Aspect.cs

I had a runtime error when using this.EntityWorld.EntityManager.GetEntities(Aspect aspect) due to null entities which are also found in EntityManager.ActiveEntities
Merge pull request #65 from GrafSeismo/patch-1

Update Aspect to prevent runtime error
Update Aspects Interests with DebugAssert and remove of previous change.
Merge pull request #66 from GrafSeismo/patch-2

Update Aspects Interests with DebugAssert and remove of previous change.