[FEATURE] Support target attribute for `link-to` helper
[BUGFIX beta] Normalize the `if` and `bind-attr` truthiness

Changelog updated
Merge pull request #4718 from selvagsz/feature_support_target_attribute_for_linkto

[FEATURE ember-routing-linkto-target-attribute]
Merge pull request #4662 from selvagsz/normalize_if_and_bindAttr_truthiness

[BUGFIX] Normalize the `if` and `bind-attr` truthiness