RFC: Config

My idea for the config is as follows:

• everything that's configurable goes in the config.
• All plugins expose their configuration through the config
• Enabling plugins can be done through the config and the module-manager (tbd)

Examples

import {apiConfig} from './api';
{
  plugins: ['aurelia-api', 'aurelia-orm', 'aurelia-authentication'],
  api: apiConfig
}