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

[Paul Norman]

> @@ -407,9 +407,11 @@ int node_ram_cache::set(osmid_t id, double lat, double lon, const taglist_t &) {
>      if ( (allocStrategy & ALLOC_DENSE) > 0 ) {
>          return set_dense(id, ramNode(lon, lat));

whoops, this part still needs some work to adjust to the void return

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https://github.com/openstreetmap/osm2pgsql/pull/395/files#r34849109
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