David Pilato 0ff61e1d6f Add time_zone setting for query_string
Query String query now supports a new `time_zone` option based on JODA time zones.
When using a range on date field, the time zone is applied.

```json
{
"query": {
  "query_string": {
    "text": "date:[2012 TO 2014]",
    "timezone": "Europe/Paris"
  }
 }
}
```

Closes #7880.
2014-10-20 19:09:45 +02:00
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2014-10-15 21:42:22 +02:00
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