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

[Sarah Hoffmann]

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

You should document the pure virtual functions in middle.hpp.

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