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

[Greg Troxel]

Works on on NetBSD 7 amd64 with gcc 4.8.4, with no warnings.
When building on NetBSD 6 i386, which has gcc 4.5 native, but configured with gcc 4.8.4 in $PATH, I get complaints 
/home/gdt/SOFTWARE/GEO/osm2pgsql/contrib/libosmium/osmium/io/bzip2_compression.hpp:91:30: error: ‘to_string’ is not a member of ‘std’
                     error += std::to_string(bzlib_error);
                              ^
and this might be a cmake issue; it's unclear to me how compiler selection and the right includes/libs get set.   Has this been tested on other systems where the system compiler is < 4.8, but 4.8 is available via a package at a different path?

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