fix; apply methods to single embedded schemas (Fix #3534)

Author: vkarpov15

lib/schema/embedded.js

@@ -23,6 +23,16 @@ function Embedded(schema, path, options) {
   _embedded.$isSingleNested = true;
   _embedded.prototype.$basePath = path;
 
+  // apply methods
+  for (var i in schema.methods) {
+    _embedded.prototype[i] = schema.methods[i];
+  }
+
+  // apply statics
+  for (i in schema.statics) {
+    _embedded[i] = schema.statics[i];
+  }
+
   this.caster = _embedded;
   this.schema = schema;
   this.$isSingleNested = true;