Update ember-getowner-polyfill for babel 6.6.x support

[mainmatter]

Update ember-getowner-polyfill for babel 6.6.x support

[BillyRayPreachersSon]

As with the comment against the same issue for ember-simple-auth, would you be able to publish a new major version without the polyfill that supports only Ember 2.4+, thus negating the issue of backwards compatibility for those using the new version?

[marcoow]

I think we already allow the latest version of ember-getowner-polyfill? see https://github.com/simplabs/ember-cookies/blob/master/package.json#L24

[BillyRayPreachersSon]

Out of interest, what version is the minimum version of Ember this addon is trying to support? If it's Ember 2.4, then the ember-getowner-polyfill reference can be removed altogether and this warning will go away.

We've managed to get from 29 of these deprecation warnings down to 7, and 3 of those are from simplabs addons (ember-simple-auth and ember-cookies). It would be lovely to have no warnings :)

[marcoow]

We're supporting Ember 1.13 and up and thus needs the polyfill unfortunately.