* 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

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

* fixed typo

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

There are situation where adding multiple queries is super beneficial. 

This PR enables package users to call `$search->addQueries(...)` in two different ways.

#### Single dimension array parameter

In this case an array of `BuilderInterface $query` are passed to the root `$search->addQuery()` function.

#### Multi dimensional array parameter

In this case an array of arrays is passed in, each member of the array is to match the function signature of `$search->addQuery()` and the PHP 5.4 traversable unpacking language feature is used to parameterise the root `$search->addQuery()` function.

(cherry picked from commit 8458ac9)

* implemented relation for geo_shape query

* switched position and coordinates parameters

* Switched parameters for tests as well

* Deprecated parameter position

* Overwrite relation

* fixed unit tests to support phpunit 6

* do not use sudo

* update elasticsearch in the travis env and use docker vm

* add java jdk8

* temporary remove elasticsearch scripting

* clean up travis file

* null cannot be used in count() functions anymore in 7.2

'_source_exclude' and '_source_include' was missing in parameters whitelist.

* Getter for nested query.

Currently there is not possibility to get query object when it is wrapped inside nested query.

* Exposing path for nested query.

* Removing not needed space.

* added documentation for geo distance range query

* added a deprecation message to geo distance range query

* bump development version number

* add scroll to URI parameters, fixes #201