- Work done on Repository and QueryBuilder -- fixed some minor bugs and added some delete() functions

- Added a generic SQL query function to PDOObject

src/EntityCollection.php

@@ -2,7 +2,22 @@
 
 namespace Ulmus;
 
+use Generator;
+
 #class EntityCollection implements \Countable, \ArrayAccess
 class EntityCollection extends \ArrayObject {
    #  use Common\ArrayObjectTrait;
-}
+    
+    public function filters(Callable $callback) : Generator
+    {
+        $idx = 0;
+        
+        foreach($this as $key => $item) {
+            if ( $callback($item, $key, $idx) ) {
+                $idx++;
+                
+                yield $item;
+            }
+        }
+    }
+}