[Tile-serving] [osm2pgsql] Fix warnings when compiling tests, use -Werror with travis (#395)

[Paul Norman]

>          return set_sparse(id, ramNode(lon, lat));
> -    return 1;
> +    }
> +    // can this fall through to the end?
> +    throw std::logic_error((boost::format("Fell through in node_ram_cache::set with allocStrategy %1%") % allocStrategy).str());

the different command line options always set ALLOC_DENSE or ALLOC_SPARSE

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https://github.com/openstreetmap/osm2pgsql/pull/395/files#r34849083
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