* Add getQuery Method to FunctionScoreQuery

Add getQuery Method to FunctionScoreQuery in order to apply changes to query of FunctionScoreQuery.

* Update FunctionScoreQuery.php

# Conflicts:
#	composer.json

* fixes #257 - added $format arg to date histogram

* fixed typo

Example `['from' => 0, 'to' => 0]` is a valid aggregate range

# Conflicts:
#	composer.json