Release version 0.16-SNAPSHOT
[release] bumped versions after release
[task] added accept header
[fix] changed 'resource-server/authentication/user' endpoint to POST
[fix] made search for group membership less restrictive
[fix] made search for all multi-valued attributes membership less
restrictive
[release] updated versions before release
Release version 0.15.5
Merge Release 0.15.5