Add an AUTHORS file and a CONTRIBUTORS file.
Relicense as Modified BSD (3-Clause).
Clarify new-contributors comments in CONTRIBUTORS.md
Fix typo in AUTHORS.md
Fix AUTHORS formatting.
Fix CONTRIBUTORS formatting.
Add last missed author.
Change License in readme.
Merge pull request #279 from Astron/license/bsd-3

License: Migrate to Modified BSD (3-Clause)
Bugfix: Use the client_agent log if the Client is disconnected before its log has been setup.
Merge branch 'master' into feature/mongodb-backend