AddComponentFromPool<T>(Action<T> init)

Implemented a method that allows you to add a poolable component
completely initialized:
so that Systems are notified about the component with all data already
set.
Merge pull request #55 from Maximusya/AddComponentFromPool-with-init-code

Add component from pool to entity after running init code
Merge pull request #4 from thelinuxlich/master

update to latest revision