Change README.md
Change README.md.
Add ezglib.ecs: An Entity Component System.
Some changes to ezglib.event, as well as beginning a general rendering system.
Add fps option to defgame.
Change version back to 0.0.0-SNAPSHOT.
Add rendering system. Fix Bugs.
Fix nested entities.
Remove defgame macro.
Move most functionality to core namespace.
Big fixes to entity system.
Merge master