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

[Paul Norman]

> @pnorman : would you prefer optional CXXFLAGS like -Werror -pedantic -Wall as variable or inside CMakeLists.txt?

Outside - ideally we shouldn't be hard-coding *any* flags but telling cmake we want all warnings. We shouldn't be specifying `-Werror` in the build system.

Within Travis is different - we want to check code quality pre-merge, so any warnings should cause the Travis build to fail and we want the compiler to be very picky hence `-Werror -Wall -pedantic` in order to stop problems from sneaking in.

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https://github.com/openstreetmap/osm2pgsql/pull/460#issuecomment-148965577
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