[BUGFIX] The {{link-to}} helper should not transition if target is not equal to _self or empty
Merge pull request #5349 from dschmidt/notransitionontargetblank

[BUGFIX] The {{link-to}} helper should not transition for target=_blank
[BUGFIX beta] Added tabindex bound property and relevant test to link-to helper
Merge pull request #5377 from Myztiq/link-to-tabindex

[FEATURE ember-routing-linkto-tabindex-attribute]
[BUGFIX beta] sync rsvp.js
Merge pull request #5378 from emberjs/sync-rsvp-3.0.13

[BUGFIX beta] sync rsvp.js
[BUGFIX beta] Fix QP link issue upon app reload

Fixes a bug reported by @mixonic where some links that
didn’t specify query params were resetting query
params set from the URL at boot time.
Merge pull request #5384 from machty/qp-boot

[BUGFIX beta] Fix QP link issue upon app reload
[FEATURE ember-routing-multi-current-when] Use space delimter.

* Use space for delimter.
* Enable by default.
Merge pull request #5387 from rwjblue/update-and-enable-multi-current-when

[FEATURE ember-routing-multi-current-when] Use space delimter.
Deprecate LinkView.prototype.currentWhen.

Using dasherized properties in Handlebars helpers is preferred.
Merge pull request #5388 from rwjblue/deprecate-currentWhen

Deprecate LinkView.prototype.currentWhen.
[FEATURE ember-routing-linkto-target-attribute] Enable by default.
[FEATURE ember-routing-auto-location-uses-replace-state-for-history]

Enable by default.
[FEATURE ember-metal-is-present] Enable by default.
[FEATURE ember-runtime-proxy-mixin] Remove feature (make private).

* Remove feature flags.
* Make `Ember._ProxyMixin` private API for internal use.
Merge pull request #5389 from rwjblue/enable-linkto-target-attribute

[FEATURE ember-routing-linkto-target-attribute] Enable by default.
Merge pull request #5390 from rwjblue/ember-routing-auto-location-uses-replace-state-for-history

[FEATURE ember-routing-auto-location-uses-replace-state-for-history]
Merge pull request #5391 from rwjblue/enable-ember-metal-is-present

[FEATURE ember-metal-is-present] Enable by default.
Merge pull request #5392 from rwjblue/remove-proxy-mixin-feature

[FEATURE ember-runtime-proxy-mixin] Remove feature (make private).