[Tagging] Reproposal of tourism=aquarium

[Andreas Goss]

> +1, tourism=attraction is a poor scheme from the early days, maybe we should deprecate it all together, either without alternative or in favor of a flag like attraction=yes (or level0 - level 3 etc), or tourist_attraction=*

I also just see it ending up in 2x tagging everything. leisure=waterpark 
tourism=attraction + attraction=waterpark; amenity=restaurant 
tourism=attraction + attraction=restaurant etc.

And I feel like most of the values would better fit with a key like 
amusement_ride=  or amusement_ride:xxx=yes.
http://en.wikipedia.org/wiki/Amusement_ride

I mean for example a kiddie_ride you find at a supermarket is not a 
(tourist) attraction.
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