replace BitSet with Bits
bitset to Bits
Fixed issue with new entities incrementing their id by 2
Fixed issue with new entities incrementing their id by 2 (revised): The intentifierPool needs to checkOut the id both for new and pooled entities, otherwise it will give out id's that are already assigned to existing entities.
Added Entity constructor without id parameter for Pool<Entity> in EntityManager
Merge remote-tracking branch 'upstream/master'
Intellij added to .gitignore
Removed some files that should be ignored
Removed some files that should be ignored2
Merge pull request #40 from vkvam/master

createEntityInstance in EntityManager increments entity id's twice