Removing Stage and Scene.

I'm dumb. These should both be components that manage
other entities instead of entirely separate things
that don't fit into the entity/component model.
Exposing built-in components on loki module.
Duh -- use Date.now() instead of making Date objects.
Utility method for making component pipelines.
Use createComponentPipeline from util.
web-ticker using pipeline to tick updates.
Switch to 'tick' method instead of 'update' event for 2d-physics.
Removed 'update' event and added 'tick' method to web-input-keyboard.
Helpful web-ticker validations.
Renderer uses 'tick' instead of stupid 'post-update' event.
Uses new web-ticker functionality.