[Photon] Faster download & extract

[Christoph Lingg]

Good point, just updated the readme: https://github.com/komoot/photon/commit/256d27b2af6b7b347fbe83b229aa51c3f68e03f5

> Am 20.02.2015 um 16:25 schrieb Peter <graphhopper at gmx.de>:
> 
> Hi,
> 
> one could download and extract in one step and make this faster:
> 
> wget -O - http://photon.komoot.de/data/photon_data_021_150112.tar.bz2 |
> bzip2 -cd | tar x
> or via pbzip2
> wget -O - http://photon.komoot.de/data/photon_data_021_150112.tar.bz2 |
> pbzip2 -cd | tar x
> 
> Regards,
> Peter
> 
> 
> 
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