Remove © and remove unnecessary encoding lines

The word "Copyright" alone is sufficient to claim copyright, the ©
need not be present.[1]

As per PEP 263, a Python file with non-ASCII characters must have a
line with "coding: <some-encoding>". Python files containing only
7-bit ASCII characters need no such line.[2]

This commit removes unnecessary Unicode copyright symbols and
unnecessary encoding lines.

[1]: http://www.copyright.gov/circs/circ03.pdf
[2]: http://legacy.python.org/dev/peps/pep-0263/

Change-Id: Ibf66632ddb4942d9eabcb03a2c6807004bc972be
Merge "Remove © and remove unnecessary encoding lines"