Randomize list in Mercator puzzle

```
In https://gmaps-samples.googlecode.com/svn/trunk/poly/puzzledrag.html we 
always get the same list of 15 countries. If this list was random we could have 
endless fun. =)

```

Original issue reported on code.google.com by `kenji.to...@gmail.com` on 1 Feb 2013 at 1:35
