add spatial component

add basic support for nested documents

rename method

don't always pass xml string as parameter (too expensive with long documents)

Allows key and exclude for interval facet

Update grouping-component.md

Added 'suggest' for Criteria in composer.json

Added 'suggest' for Criteria in composer.json

Update getting-started.md

Updated to the latest version

Add support for grouping result using a function

Add functionality that checks whether the result data in
ResponseParser\Component\Grouping contain groups created by
solr parameter `group.func` (an arbitrary Solr-supported
function).

When such field is found, apply the same parsing logic
which is usually used for field-grouping, in order to ensure
the function-grouping is recognized and added to the FieldGroup
result object.

Fix fenced block start.

Do not parse collation array for Solr 5+; values are already in name/value pairs. Change unit test to match the collation data structure returned by Solr.

Do not parse collation array for Solr 5+; values are already in name/value pairs. Change unit test to match the collation data structure returned by Solr.

fix sample-code in Plugin System section

Tested on solr 5 and 6 versions

Merging develop to master for new release

Fix readthedocs domain

Update coveralls settings

Actually use ClientInterface

corrects php docblock in result-of-a-select-query

fix typo on docs index.md

It's a pretty glaring error on the main page (and thus on Google results).

Stats percentiles