[Tile-serving] [mod_tile] Add 'null' storage (#19)

[Matt Amos]

Added simple 'null' storage, which might be useful for benchmarking or testing. It doesn't store anything - but will respond with success to a write request and return a "not found" result to any read request.
You can merge this Pull Request by running:

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

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

  https://github.com/openstreetmap/mod_tile/pull/19

-- Commit Summary --

  * Added simple 'null' storage, which might be useful for benchmarking or testing.

-- File Changes --

    M Makefile.am (2)
    M store.c (6)
    A store_null.c (77)
    A store_null.h (16)

-- Patch Links --

https://github.com/openstreetmap/mod_tile/pull/19.patch
https://github.com/openstreetmap/mod_tile/pull/19.diff

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