added rescore query
added weight setters
added rescore test stubs
Finished rescore and tests
fixed naming and added changes to changes.txt
added elasticsearch test for rescore
fixed changes.txt conflict
fixed naming convention again
restructured rescore classes and added setRescore to both Query and Search and the accompanying tests
updated changes.txt
removed some outdated changes
Nested filter supports now the setFilter method.

When using elastica to perform a search using only filters there was no method
to set an AbstractFilter to the nested Filter so I've added the setFilter method.
bulk update added
Create test for the NestedFilter that supports setFilter.
Add some Match query parameters for MultiMatch query
Add missing settings for Match Query
Add author
Add more match options
There doesn't seem fuzzy_rewrite
tests added for bulk update operation