first draft technical board/code of conduct
Drop Django 1.4 and 1.5 official support
Add dropped support to release notes
typo, minor changes
Restore django-mptt in docs, removed elsewhere
Added list of retired core developers
Fixes #3558. CMSSitemaps now work correctly with multiple sites.
Updated historical note
Merge pull request #3526 from evildmp/technical-board

Development of django CMS
Merge pull request #3525 from yakky/feature/drop_1.5

Drop support for Django 1.4 / 1.5
Merge pull request #3559 from jgoettsch/develop

Fixes #3558. CMSSitemaps now work correctly with multiple sites.