[openstreetmap/openstreetmap-website] Switch to TIMESTAMP WITH TIME ZONE for current_* tables (#375)

[mmd]

The "Z" (zulu) character in the timestamp string implies that all timestamps should be returned in UTC-0, no matter what time zone the server runs in. 

I also remember seeing some issues when populating the database via osmosis from a UTC+3 terminal (see this year's GSoC project: https://github.com/osmlab/yalcha/issues/11). This ended up creating wrong timestamps all over the place. Not sure, if this behaviour would be any different with osmosis and `timestamp with timezone`.

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