Add as_georss / as_kml methods as used by GeoRuby to RGeo::Cartesian::PointImpl

rgeo.rb

# add to config/initializers/
module GeoPointConversion
  def as_georss
    "<georss:point>#{y} #{x}</georss:point>\n"
  end

  def as_kml
    "<Point>\n<coordinates>#{y},#{x}</coordinates>\n</Point>\n"
  end
end

RGeo::Cartesian::PointImpl.send(:include, GeoPointConversion)