Apply the Apache 2.0 license correctly

[tsahi]

Describe the bug
The code is released under the Apache License version 2.0. We should follow the guidelines on how to apply the license, as described at http://www.apache.org/licenses/LICENSE-2.0

To Reproduce
Steps to reproduce the behavior:

1. Go to any file
2. Look for the Apache boilerplate
3. Go to LICENSE.txt
4. Look for the license text

Expected behavior
The following boilerplate should be at the top of every file:

Copyright 2013 (c) Microsoft

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.

and the license text should be at LICENSE.txt

[tsahi]

I just copied the above from my own fork of the DAAB archive repository. I didn't notice we already have a LICENSE file with the Apache license in it. So the question is just is the boilerplate required by the license or not.