[Tile-serving] [osm2pgsql] Use std::vector for tags, members and nodes (#331)

[Paul Norman]

travis is failing with 
```
./configure: line 5194: syntax error near unexpected token `,optional'
./configure: line 5194: `AX_CXX_COMPILE_STDCXX_11(,optional)'
```

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https://github.com/openstreetmap/osm2pgsql/pull/331#issuecomment-92123517
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