#attach deletes image after attaching #46
Description
The attach method deletes the image it just attached when it's done.
- This should not be the responsibility of the library. The library should rely on express (or the system) to clean up its own tmp files.
My integration tests attach images to object. In tests, I have to read my fixture file, create a tmp file for it, then attach it since mongoose-attachments is going to delete it. That's a lot of overhead for something the library shouldn't be doing.