Update ember-cli to version 2.12.3 🚀

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Hello lovely humans,

ember-cli just published its new version 2.12.3.

State	Update 🚀
Dependency	ember-cli
New version	2.12.3
Type	devDependency

This version is not covered by your current version range.

Without accepting this pull request your project will work just like it did before. There might be a bunch of new features, fixes and perf improvements that the maintainers worked on for you though.

I recommend you look into these changes and try to get onto the latest version of ember-cli.
Given that you have a decent test suite, a passing build is a strong indicator that you can take advantage of these changes by merging the proposed change into your project. Otherwise this branch is a great starting point for you to work on the update.

Do you have any ideas how I could improve these pull requests? Did I report anything you think isn’t right?
Are you unsure about how things are supposed to work?

There is a collection of frequently asked questions and while I’m just a bot, there is a group of people who are happy to teach me new things. Let them know.

Good luck with your project ✨

You rock!

🌴

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GitHub Release

Setup

1. npm uninstall -g ember-cli -- Remove old global ember-cli
2. npm cache clean -- Clear NPM cache
3. bower cache clean -- Clear Bower cache
4. npm install -g ember-cli@2.12.3 -- Install new global ember-cli

Project Update

1. rm -rf node_modules bower_components dist tmp -- Delete temporary development folders.
2. npm install --save-dev ember-cli@2.12.3 -- Update project's package.json to use latest version.
3. npm install -- Reinstall NPM dependencies.
4. bower install -- Reinstall bower dependencies.
5. ember init -- This runs the new project blueprint on your projects directory. Please follow the prompts, and review all changes (tip: you can see a diff by pressing d). The most common source of upgrade pain is missing changes in this step.

Changelog

The following changes are required if you are upgrading from the previous
version:

• Users
  • ember new diff
  • Upgrade your project's ember-cli version - docs
• Addon Developers
  • ember addon diff
  • No changes required
• Core Contributors
  • No changes required

Community Contributions

• #6986 Revert nopt dependency update @calderas

Thank you to all who took the time to contribute!

[zachgarwood]

Closed in favor of #115