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

[Paul Norman]

>  
> -    virtual int ways_get(osmid_t id, taglist_t &tags, nodelist_t &nodes) const = 0;
> +    // returns true if it got the relation

What's the best way to have API documentation for functions like this? This was a note from the cleanup that I decided to leave in.

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https://github.com/openstreetmap/osm2pgsql/pull/395/files#r34848819
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