Re-add template id fields to Project model.

The original pull request (/web-sharelatex-internal/pull/324) had to be reverted
because of a failing test. This just re-adds the fields

services/web/app/coffee/models/Project.coffee

@@ -48,6 +48,8 @@ ProjectSchema = new Schema
 		}
 	tokenAccessReadOnly_refs         : [ type:ObjectId, ref:'User' ]
 	tokenAccessReadAndWrite_refs     : [ type:ObjectId, ref:'User' ]
+	fromV1TemplateId: { type: Number }
+	fromV1TemplateVersionId: { type: Number }
 	overleaf          :
 		id              : { type: Number }
 		imported_at_ver_id : { type: Number }