Fix deprecations from deprecation-workflow (and probably remove it at all)

We have a plugin ember-cli-deprecation-workflow which allows us to hide some deprecation messages. However if we want to be able to update Ember to the v3 we’d better fix those deprecations.

Some of them are brought the project dependencies, so if there aren’t new version of those dependencies let’s at least identify them at list them down.

If all deprecations will be fixed I suggest removing the plugin at all.

• ember-getowner-polyfill.import (should be fixed in #1382)
• ember-metal.binding
• ember-views.did-init-attrs (should be fixed in #1369)
• ds.serializer.private-should-serialize-has-many (should be fixed with the ember-pouch update)

[internets]

@stukalin I’ve been doing a lot of 2.18 updates for 2.x ember apps lately, I’d like to take this on. Ultimately I’d like to take on #1365 as well, but doing this first should make the PRs more manageable. Would you be open to marking #1365 as in progress as well to prevent some potentially ugly merge scenarios?

It looks like #1369 and #1366 are in progress and will be addressing some aspects of this PR. If those turn out to be non-trivial, I can wait for them to land on master and rebase.

[stukalin]

This issue will be resolved once #1382 and #1369 are fixed. Hence, I’ll take away the in progress label for the time being.