[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

[Doxygen formatting](http://www.stack.nl/~dimitri/doxygen/manual/docblocks.html) is pretty much the standard for any C/C++ API documentation. Use autobrief and markdown support for best readability results. You can look into the libosmium code as an example.

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https://github.com/openstreetmap/osm2pgsql/pull/395/files#r34867398
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