the private message stream is different to normal streams, improving the ui a bit and collapsing conversations
proper 404 for json request 404
don't error out on not posts if its a json request
Replaced `Em.run.next` with the more proper `Em.run.schedule('afterRender')`
when we are waiting for rendering to finish.
Replaced {{view Discourse.TextField}} with {{textfield}} helper.
Replace Ember.Text* insertions with helpers.
Merge remote-tracking branch 'upstream/master'