Update main project license for .NET Foundation

Ix.NET/Source/license.txt → LICENSE

@@ -1,6 +1,5 @@
-Copyright (c) Microsoft Open Technologies, Inc.  All rights reserved.
-Microsoft Open Technologies would like to thank its contributors, a list
-of whom are at http://rx.codeplex.com/wikipage?title=Contributors.
+Copyright (c) .NET Foundation and Contributors
+All Rights Reserved
 
 Licensed under the Apache License, Version 2.0 (the "License"); you
 may not use this file except in compliance with the License. You may

Rx.NET/Source/license.txt

@@ -1,15 +0,0 @@
-Copyright (c) Microsoft Open Technologies, Inc.  All rights reserved.
-Microsoft Open Technologies would like to thank its contributors, a list
-of whom are at http://rx.codeplex.com/wikipage?title=Contributors.
-
-Licensed 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.