Revert "Throw away some legacy Beta stuff related to Mood Picker and unused post templates."

This reverts commit 3cb34e442cfc8cdb372ab653684b0943c1eb3a36.

	new file:   app/assets/javascripts/app/models/post.js
	new file:   app/assets/javascripts/app/models/post/interactions.js
	new file:   app/assets/javascripts/app/models/post/template_picker.js
	new file:   app/assets/javascripts/app/views/post/canvas_frame.js
	new file:   app/assets/javascripts/app/views/post/mood_view.js
	new file:   app/assets/javascripts/app/views/post/small_frame.js
	new file:   app/assets/javascripts/app/views/post/stream_frame.js
	new file:   app/assets/javascripts/app/views/post/stream_interactions_view.js
	new file:   app/assets/javascripts/app/views/post_view.js