[Tile-serving] [mod_tile] Improve CORS support (#40)

[Tom Hughes]

This will fix #39 and cleanup a few other things:

* Only treat OPTIONS as preflight if Access-Control-Request-Method  is set
* Only send Access-Control-Allow-Headers for preflight requests
* Don't send a bogus Access-Control-Allow-Headers value

There is a good flowchart at http://www.html5rocks.com/static/images/cors_server_flowchart.png showing how CORS should work on the server end.
You can merge this Pull Request by running:

  git pull https://github.com/tomhughes/mod_tile cors

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

  https://github.com/openstreetmap/mod_tile/pull/40

-- Commit Summary --

  * Improve CORS support

-- File Changes --

    M src/mod_tile.c (18)

-- Patch Links --

https://github.com/openstreetmap/mod_tile/pull/40.patch
https://github.com/openstreetmap/mod_tile/pull/40.diff

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