Upgrade to ember-cli 2.12.3

[notmessenger]

This project uses semver, please check the scope of this pr:

• #none# - documentation fixes and/or test additions
• #patch# - backwards-compatible bug fix
• #minor# - adding functionality in a backwards-compatible manner
• #major# - incompatible API change

CHANGELOG

• Upgrade to ember-cli 2.12.3

[coveralls]

Changes Unknown when pulling d9df1c0 on notmessenger:ember-cli-2.12.3 into ** on ciena-frost:master**.

[notmessenger]

@srowhani @sglanzer Do either of you recall the reason for including this package and setting the dummy app up to use it? What was trying to be accomplished?

[srowhani]

It's there to illustrate how you can mount engines.

[notmessenger]

Is there something special about this repo and how it interacts with engines? Are links to engines different, etc? Is there something specific (needing to be) tested by doing so? Is it crucial that this happen?

[srowhani]

The repo is the engine, it should not be removed.

[notmessenger]

@srowhani Is there something specific about the way that ember-frost-navigation needs to mount an engine that it needs to have an example of doing so? Otherwise we're just replicating information about how to use ember-engines that a user could get from reading ember-engine's instructions, right, in what appears to be a random location for doing so? Any other repo could just as easily be used to illustrate how to mount engines, correct? I'm trying to ascertain if there is something special/specific about the relationship between ember-frost-navigation and ember-engines that I am not seeing.

[coveralls]

Changes Unknown when pulling d724c95 on notmessenger:ember-cli-2.12.3 into ** on ciena-frost:master**.

[juwara0]

Approved