[Tile-serving] [mod_tile] Allow render_old to take a unix timestamp (#32)

[Tom Hughes]

This extended the `--timestamp` to render_old to take a full unix timestamp as well as a simple date.
You can merge this Pull Request by running:

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

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

  https://github.com/openstreetmap/mod_tile/pull/32

-- Commit Summary --

  * Add gitignore
  * Allow timestamp to be specified to render_old as a unix timestamp

-- File Changes --

    A .gitignore (30)
    M render_old.c (20)

-- Patch Links --

https://github.com/openstreetmap/mod_tile/pull/32.patch
https://github.com/openstreetmap/mod_tile/pull/32.diff

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