wiki_pages: Grab a very long "Isle of Man" tag from the wiki

This funky line wrapping is actually not a YAML syntax error:

    $ ruby -ryaml -rpp -e 'x = YAML.load(File.read("config/wiki_pages.yml")); pp x'|grep -B1 'Isle of'
         "source=Isle_of_Man_Government_aerial_imagery_(2001)"=>
          "Tag:source=Isle of Man Government aerial imagery (2001)",
    --
         "source=Isle_of_Man_Government_1:25000_map_(2007)"=>
          "Tag:source=Isle of Man Government 1:25000 map (2007)",

Abandon all hope ye who use YAML.