Implemented GeoDistanceFacet.
Merge pull request #255 from dourvaris/master

GeoDistanceFacet implementation.
Merge pull request #256 from leo-naeka/master

Improved changes made in 9c8799f, allowing to pass kwargs to ES
Update pyes/queryset.py

Cloning of QuerySet now includes ordering.
Update pyes/queryset.py

Remove duplicate operation.
Update pyes/queryset.py

Include "start" offset in search.
Merge pull request #257 from snotling/master

Fix QuerySet code
Added TypeFilter
All filters can be named
Don't need deepcopy
Fixed broken extra filter parameters (_cache, _cache_key etc.) and overall filter refactoring
Pulled common bits of HasChildFilter and HasParentFilter to HasFilter
Dropped to_json()
Use encode_json() more
Dropped Query.to_query_json() and extracted ES._encode_query()
Dropped to_search_json()
General import cleanup
Merge pull request #258 from gsakkis/master

Added TypeFilter
Dropped 'q' property
added shutdown support need to write tests