v1.0.18

Patch release

• Added the enabled flag on both Entity & Component class objects.
  You can now hide specific components in queries by simply .enable() or .disable() them (or the associated Entity object).
• Improved hierarchy management for Entity class objects.
  • When a parent entity is attached / detached to the World, all the children entities are attached / detached to the world too.
  • When a parent entity is disabled, all the children entities (and their components) are also hidden too.
    Children entities can still specify by its own if they're enabled or not.
• Catched some edge-cases where not exceptions were raised, even though they should have been.
• Better error handling.
• Removed unused events from World.

Full Changelog: v1.0.17...v1.0.18