Merge pull request #285 from CGenie/master

fix GeoDistanceFilter optimize_bbox setting on __init__
Merge pull request #286 from CGenie/cgenie

Add options support for aliases
add DocumentMissingException exception
Added rescore query.
Alias tests pass.
Working tests. RescoreQuery now must be converted to a search object.
Index stats tests pass.
Merge pull request #288 from maciejkula/master

Fixes for test failures.
Merge pull request #289 from maciejkula/rescore_query

Add support for rescore queries
Merge pull request #287 from Fiedzia/more_exceptions

add DocumentMissingException exception