Makes initialization happen automatically when using ember-addon

This refactors the ember-addon story for Torii to work a little more cleanly.
It also gets rid of the 'torii/ember' module with side effects, in favor of defining the initializers in the format that [ember-load-initializers](https://github.com/stefanpenner/ember-load-initializers) expects.

_do not merge yet_

Stil to do:

  * [ ] update README to explain how to install Torii when using ember-cli/ember-addon
  * [ ] update REAMDE to explain how to install Torii when simply using the bower package
  * [ ] publish the npm module 'torii'
  * [ ] probably bump the version number to indicate that the changes — perhaps this is time to move off the '0.0.x' versions

  * remove torii/ember
  * move initializers into lib/torii/initializers
  * add copy:appAddOn task that moves initializers into
    app-addon/initiailizers so that ember-cli's loadInitializers can
    auto-load them
  * add copy:vendorAddOn task to move built named amd dist into
    vendor/torii/torii.amd.js. This is a nice namespacing for the
    app.import statement that ember-addon's `included` hook calls
  * modify ember-addon's `included` hook so that it explicitly declares
    the torii module exports that the initializers will need