Merge branch 'develop' of https://github.com/stan-dev/stan into develop
Merge branch 'develop' of https://github.com/stan-dev/stan into develop
Merge branch 'develop' of https://github.com/stan-dev/stan into develop
added README for Stan Development Team clarification
Merge pull request #671 from stan-dev/feature/issue-508-copyright

Fixes #508. Feature/issue 508 copyright