Merge tag '0.3.2' into develop

Tagged release 0.3.2
changed pimple dependency to pimple/pimple 3.0.x, fixes #2
added mising comma, also see https://github.com/opendi/aurinko/issues/24
Added Core::count() and status()
Added a dependency to opendi/lang
Added Core::delete()
Added delete, import status, console commands
Minimal docs for Core in README
Added the ping command
Made Core depend on Client instead of Guzzle

Also moved post and get methods to Client for consistency.

Split Core::delete() into deleteAll(), deleteByQuery() and deleteByID()
Removed accidentally commited json data file
Added query logging to CLI commands
Added dependency to symfony/finder, used by solr import
Better logging for solr import
Added error logging in CLI
Fixed bug in delete command
Make import command import files ordered by file name
added new Solr-Function FieldCollapsing #3
removed field rows and start, cause already implented in Select-Class. #3
Fixed Core::count() to work with collections