Ember 1.9.0-beta.4

Changelog

• Add deprecation for quoteless outlet names ({{outlet main}} should be {{outlet 'main'}}).
• [BUGFIX] Update the Ember.Map#forEach callback to include the map being iterated over.
• [BUGFIX] Ensure that tagless container views are rendered properly.
• [PERF] Ember.View#_outlets is no longer observable.
• [PERF] Avoid extending a view for every {{each}}.