Extracts code from Ember and sets minimum ember-cli-babel

[locks]

• Add Code
• Add tests
• Fix loc
• Deprecate loc
• Bump ember-cli-babel to version that supports @ember/string

[rwjblue]

ATM I think the tests are probably using Ember.String and not our addon/index.js versions (due to babel polyfill for modules).

[dwickern]

Where'd htmlSafe / isHTMLSafe go?

[locks]

@ember/template

[rwjblue]

@locks - status?

[locks]

@rwjblue cleaning all the relevant repos in the AM

[SergeAstapov]

Should this be a link to ember-intl or ember-i18n or some other page about the topic?

[rwjblue]

Looks good for initial implementation.

We should:

• Create an issue to update the implementation here to avoid duplicating code. e.g. when Ember has the string functionality in it, we do not need to include our own implementation.
• Land this PR
• Update to ember-cli-babel@6.9.0
• Change index.js to use name: '@ember/string' instead of at-ember-string

[locks]

I'm updating ember-cli-babel and the index.js name since those are quick, and landing this.

[rwjblue]

Hmm. I don’t think the changes in ember-cli-babel@6.9.0 actually allow this yet. The version checker is looking upwards through node_modules to find if a package is present, and I don’t think we actually handle the project itself being the package...