[Tile-serving] [osm2pgsql] Add cmake build scripts and appveyor.yml (#460)

[Paul Norman]

> No tests targets are generated until cmake .. -DBUILD_TESTS=ON. If we want them to be available for custom targets, EXCLUDE_FROM_ALL option can be used.
> http://stackoverflow.com/questions/3290280/cmake-and-ctest-how-to-make-target-nightly-actually-build-the-tests (but I could not remember good example of using it)

I'd prefer if we always generated the test target, but left them out of make all.

Aside from that, I'm happy with it though I might have a go at improving the docs for running the tests.

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