feat(api): add magic __no_skip__ option to each()

If you are doing "destructive" operations to your current filter, traversing a
collection using the `skip` parameter will essentially «skip» half of the
collection (without you knowing it) unless you use the new `__no_skip__` option.

Author: Hans Kristian Flaatten

index.js

@@ -53,7 +53,10 @@ let request = module.exports._requestDefaults();
           return done(null);
         }
 
-        query.skip += query.limit;
+        if (!query.__no_skip__) {
+          query.skip += query.limit;
+        }
+
         module.exports[type].each(query, callback, done);
       });
     });