Switch to Apache 2.0 license

Previous contributors said:

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Date: Thu, 20 Feb 2014 13:04:47
From: Timo Teras <timo.teras@iki.fi>
To: Dave Rolsky <drolsky@maxmind.com>
Subject: Re: Relicensing libmaxminddb to Apache License v2.0

Hi,

On Thu, 20 Feb 2014 12:14:44 -0600 (CST)
Dave Rolsky <drolsky@maxmind.com> wrote:

> We'd like to relicense libmaxminddb under Apache License, Version 2.0
> (https://www.apache.org/licenses/LICENSE-2.0.html).
>
> Since you sent a patch a little while back that we incorporated we
> need to to get your approval to make this change.
>
> Please let me know if that's ok with you.

I approve the license change to Apache License, on my contributions
part.

Thanks,
 Timo

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"I don't care about the license, feel free to use it as you see fit as long as it stays opensource."

See https://github.com/maxmind/libmaxminddb/pull/13 for the full exchange.
Rename COPYRIGHT to NOTICE
Add the full license text back in LICENSE
Merge pull request #14 from maxmind/dave/apache-license

Switch to Apache 2.0 license