Add license and copyright for NhPartialEvaluatingExpressionVisitor

Author: maca88

src/NHibernate/Linq/Visitors/NhPartialEvaluatingExpressionVisitor.cs

@@ -1,4 +1,21 @@
-using System;
+// Copyright (c) rubicon IT GmbH, www.rubicon.eu
+//
+// See the NOTICE file distributed with this work for additional information
+// regarding copyright ownership.  rubicon licenses this file to you under 
+// the Apache License, Version 2.0 (the "License"); you may not use this 
+// file except in compliance with the License.  You may obtain a copy of the 
+// License at
+//
+//   http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software 
+// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT 
+// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the 
+// License for the specific language governing permissions and limitations
+// under the License.
+// 
+
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Linq.Expressions;