Status & ember-cli-typescript compatibility

The [`initial-implementation`](https://github.com/typed-ember/ember-cli-addon-docs-typedoc/tree/initial-implementation) branch is not compatible with the latest [`ember-cli-typescript@beta`](https://github.com/typed-ember/ember-cli-typescript/tree/v2.0.0-beta.3) any more.

I would like to know your opinion regarding the best way forward. Do you think it is worthwhile to fix this docs generator, when `ember-cli-typscript@2` is released?

I've also submitted https://github.com/ember-learn/ember-cli-addon-docs-esdoc/pull/7 to enable crude TS support via `ember-cli-addon-docs-esdoc`.

I guess that in the end we'll want build `ember-cli-addon-docs-tsdoc` or some docs generator that is built on `tsdoc`, as `tsdoc` itself seems to be [very minimal in scope](https://github.com/Microsoft/tsdoc/issues/115).