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

[alex85k]

Thanks for help! Committed the workarounds and readme updates. With them cmake line is shorter:
```sh
export CC=/gpfs/soft/gcc/5.2.0-rh6/bin/gcc CXX=/gpfs/soft/gcc/5.2.0-rh6/bin/g++
export CMAKE_PREFIX_PATH=/gpfs/soft/postgresql/v945_gcc520
cmake -DBOOST_ROOT=/gpfs/soft/boost/gcc520 -DLUA_LIBRARY=/gpfs/soft/gcc/5.2.0-rh6/lib/liblua.a -DBUILD_TESTS=ON 
```


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https://github.com/openstreetmap/osm2pgsql/pull/460#issuecomment-150784901
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