[openstreetmap-website] Add GPLv2 license file and mention in README (#15)

[Tom MacWright]

Does what it says on the tin, references Issue #14 and [this document](http://grant.dev.openstreetmap.org/tmp/rails-port-contributors.html). (my contributions can also be included in GPLv2, and I'll agree to any license between there and Public Domain, but not any more restrictive license lik GPLv3.)

You can merge this Pull Request by running:

  git pull https://github.com/tmcw/openstreetmap-website license

Or you can view, comment on it, or merge it online at:

  https://github.com/openstreetmap/openstreetmap-website/pull/15

-- Commit Summary --

* Add GPLv2 license file and mention in README

-- File Changes --

A LICENSE (339)
M README.mkdn (4)

-- Patch Links --

  https://github.com/openstreetmap/openstreetmap-website/pull/15.patch
  https://github.com/openstreetmap/openstreetmap-website/pull/15.diff

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/pull/15