Use `_ref` and not `_id` to store remote IDs for graph connections
Add icons to 'save' and 'cancel' buttons
Add the possibility to delete objects
Fix edit/create mode detection error in the edit dialog template
Rename the function `openDialog` to `openEditDialog`
Add a helper for creating confirmation dialogs
Ask for confirmation before deleting an object
Generate proper GUIDs for object ids, instead of using timestamps
Fix $data.updateObject issues

* Cloned object to the data store instead of the original.
* Don't set the _id property on the original object.