Reach license clarity

[techtonik]

This means adding header to files and mention all used licenses in COPYING, like this:

# This software is dedicated to the Public Domain.
# See COPYING in the project root for more info.

For example, at least these two files are not public domain:

• gratipay/security/crypto.py
• gratipay/security/csrf.py

and should carry different header:

# Copyright (c) Django Software Foundation and individual contributors.
# All rights reserved. Use of this source code is governed by a BSD-style
# license that can be found in the COPYING file.

After all headers are inserted, it will be possible to find some tool to validate the assumptions.

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