Rename createTemporary to dangerouslyCreateAndAdd

Class: `ConversationController`.

This function should not be used in application code as it creates potentially
invalid `Conversation` instances in our global conversation collection. We keep
making it available for testing purposes.

js/views/conversation_search_view.js

@@ -92,7 +92,7 @@
       // Creates a view to display a new contact
       this.new_contact_view = new Whisper.NewContactView({
         el: this.$new_contact,
-        model: ConversationController.createTemporary({
+        model: ConversationController.dangerouslyCreateAndAdd({
           type: 'private',
         }),
       }).render();