Merge pull request #138 from mongoosejs/vkarpov15/remove-ducktyping

BREAKING CHANGE: remove support for `mquery(collection)`, first param is always filter

Author: vkarpov15

lib/mquery.js

@@ -55,12 +55,7 @@ function Query(criteria, options) {
   }
 
   if (criteria) {
-    if (criteria.find && criteria.deleteOne && criteria.updateOne) {
-      // quack quack!
-      this.collection(criteria);
-    } else {
-      this.find(criteria);
-    }
+    this.find(criteria);
   }
 }