[FEATURE] ember-htmlbars-component-generation

Disable HTMLBars `component` hook unless this feature is enabled.  Implemented upstream in https://github.com/tildeio/htmlbars/pull/152.

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This needs to be disabled until we are prepared to:

* Properly handled features/changes that the 2.0 RFC suggests are enabled by this syntax.
* Determine how to handle actual web components (for things like polymer interop).