[Tile-serving] [osm2pgsql] Use a logging library (#202)

[Paul Norman]

I forgot our library depends on Mapnik. I agree, that rules it out.

[log4cxx](http://logging.apache.org/log4cxx/) is another library mentioned, patterned after log4j. log4cxx is packaged on Ubuntu 12.04, 14.04 and FreeBSD

[google-glog](https://code.google.com/p/google-glog/) is Google's. It is packaged on Ubuntu 14.04 and FreeBSD, but not Ubuntu 12.04.

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