• [BREAKING] Require Handlebars 2.0. See blog post for details.
• Allow all rejection types in promises to be handled.
• Mandatory setter checks for configurable, and does not clobber non-configurable properties.
• Remove long deprecated Ember.empty and Ember.none.
• Refactor Ember.platform.
• Ember.HashLocation no longer assumes any hash is a route, uses forward slash prefix convention #/foo.
• Log unhandled promise rejections in testing.
• Deprecate Ember.Handlebars.get.
• Warn if FEATURES flagging is used in non-canary, debug builds.
• Streamify template bindings.
• Make Ember.Namespace#toString ember-cli aware.
• Prevent extra method.toString checks when setting _super.
• [PERF] Speedup watchKey by preventing for in related deopt.
• [FEATURE] ember-routing-fire-activate-deactivate-events.
• [FEATURE] ember-testing-pause-test.