* cover Json Facets in tests

* added option 'min' to JsonAggregation

* filter empty buckets from facets during result parsing

* Added 'contains' and 'containsignorecase' to FacetSet docs

* Added Solr version for facet.contains to docs

* Removed erroneous FacetSet comments from Facet Field PHPDoc

solves issue #378 support JSON Facet API

Fix return type Result::getFacetSet()

Fix return type Result::getFacetSet()

Added support for "sow" parameter (Split On Whitespace) to select queries

Streaming expressions tend to be very long. Therfore we force the 'postbigrequest' plugin.

Increase compatibility between stream rsults ans serach result

Improved streaming expression result and added graph query for GraphML

added basic support dor Solr Cloud stream expressions

The default timeout of solarium of 5s seems to be too aggressive on travis and causes random test failures. Set it to the PHP default of 13s.

* added a basic integration test for spellcheck, highlighter and facets
* added missing getSuggester() to select result
* fixed return type of getHighlighting() on a select result
* fixed return type of getFacetSet() on a select result

This reverts commit 9afa5426.

xdebug is required for code coverage analysis

* don't escape *

* added basic integration tests for range queries and spatial searches

* fixed coding style

* Remove outdated SF versions from testing

* Cache solr downloads

* Try to not hit apache.org for cache validation

* remove obsolete Autoloader implementation

* marked range query injection prevention as security fix

* added all integration tests to group "integration"

* removed deprecated classes. fixes #564

* remove hhvm tests on travis, use Solr 7.2.1

* remove obsolete Autoloader implementation

* marked range query injection prevention as security fix

* added all integration tests to group "integration"