Returns a function for generating links to Google Maps.
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>>> from .tools import MapLink
>>> google_maps_link()(MapLink("CN Tower", "43.6426", "-79.3871"))
u'<a href="http://maps.google.com/maps?q=43.6426%2C-79.3871+%28CN+Tower%29&ll=43.6426%2C-79.3871&t=h" title="CN Tower (43.6426, -79.3871)">CN Tower</a>'