New installs will default to Ember CLI builds in Production

[david (David Taylor)]

@david

@eviltrout

In the near future all installs of Discourse will be using the Ember CLI builds.

Ember CLI is now the default for all installations of Discourse.

And now for the final step of this saga: the legacy build system is now disabled. All Discourse installs will compile assets using Ember CLI.

https://github.com/discourse/discourse/commit/12980418ae5b947fb67e0427d3afe3fd224927c4

This change will only affect people who had deliberately set EMBER_CLI_PROD_ASSETS=0 in their config. In that case, a warning will be printed during the build, and Ember CLI will be used.