Allow to define schemes for an operation

see http://swagger.io/specification/#operationObject

src/Operation.php

@@ -7,6 +7,7 @@
 use gossi\swagger\parts\ParametersPart;
 use gossi\swagger\parts\ProducesPart;
 use gossi\swagger\parts\ResponsesPart;
+use gossi\swagger\parts\SchemesPart;
 use gossi\swagger\parts\TagsPart;
 use phootwork\collection\CollectionUtils;
 use phootwork\lang\Arrayable;
@@ -18,6 +19,7 @@ class Operation extends AbstractModel implements Arrayable {
 	use TagsPart;
 	use ParametersPart;
 	use ResponsesPart;
+	use SchemesPart;
 	use ExternalDocsPart;
 	use ExtensionPart;
 
@@ -132,4 +134,4 @@ public function setDeprecated($deprecated) {
 	}
 
 
-}
+}