Britta Weber fe86c8bc88 _geo_distance sort: allow many to many geo point distance
Add computation of disyance to many geo points. Example request:

```
{
  "sort": [
    {
      "_geo_distance": {
        "location": [
          {
            "lat":1.2,
            "lon":3
          },
          {
             "lat":1.2,
            "lon":3
          }
        ],
        "order": "desc",
        "unit": "km",
        "sort_mode": "max"
      }
    }
  ]
}
```

closes 
2014-07-31 17:33:45 +02:00
..
2014-03-09 19:45:16 +01:00
2013-10-05 17:10:30 +02:00
2014-01-23 10:52:13 +01:00

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