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

[Paul Norman]

> Added final TESTS_VALGRIND option to enable memory checking in tests if needed

I'd keep this out for now, let's keep the cmake PR from growing too much in scope. We're not building the failing tests on travis right now, and I think it's okay to keep it that way.

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