[FEATURE ember-routing-add-model-option] Remove flags.

Conflicts:
	packages/ember/tests/routing/basic_test.js
[FEATURE ember-runtime-test-friendly-promises] Remove flags.

Conflicts:
	FEATURES.md
	features.json
	packages_es6/ember-runtime/tests/mixins/deferred_test.js
[FEATURE ember-metal-computed-empty-array] Remove flags.

Conflicts:
	features.json
	packages_es6/ember-runtime/tests/computed/computed_macros_test.js