Implemented destroyAll for sub-scopes

lib/abstract-class.js

@@ -613,8 +613,17 @@ function defineScope(cls, targetClass, name, params, methods) {
         this.build(data).save(cb);
     }
 
-    function destroyAll(id, cb) {
+    function destroyAll(cb) {
-        // implement me
+        targetClass.all(this._scope, function (err, data) {
+            if (err) {
+                cb(err);
+            } else {
+                data.forEach(function (el) { 
+                    el.destroy(); 
+                });
+                cb();
+            }
+        });
     }
 
     function mergeParams(base, update) {