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
Merge pull request #258 from gsakkis/master

Added TypeFilter
Merge branch 'master' of git://github.com/aparo/pyes