* Added relation parameter for pre-indexed geo_shape query

Fixes #289.

* Update .travis.yml

Added conditional to check for `GITHUB_COMPOSER_AUTH` env var

* added new NestedSort for replacing deprecated nested_filter and nested_path

* made the filter optional

* Add getQuery Method to FunctionScoreQuery

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

* Update FunctionScoreQuery.php

Changed coveralls to codecov