Allow writing initializer code in app.js

[mehulkar]

Initializers are simply functions that run during application boot (and similarly instance initializers during ApplicationInstance boot). A hook in App.extend() in app.js would be a better starting point for beginners rather than a new file and folder structure.

We can enable this by

• exposing the hook
• replacing the place initializers are run with running the hook
• changing the blueprint to run loaded initializers automatically

[rwjblue]

FWIW, it is already possible to do this. I think you can call App.initializer and App.instanceInitializer directly for each.

[mehulkar]

I specifically want to change the paradigm and expose a bridge that makes it backwards compatible. The initializer pattern is brought over from Rails, pretty sure, and I don’t think it meshes well in JS land anymore. (Not sure it’s a great pattern for Rails either, tbh).

IMO, there’s no need to have a strict format , export pattern, and directory location for stateless functions, and we are losing out on a teaching moment about Applications vs ApplicationInstances by organizing the code this way.

[mehulkar]

Opened #573 for this.