2.14 has been merged into master and the release documentation has been updated. http://webwork.maa.org/wiki/Category:Release_Notes
There are also detailed notes on building a development webwork site on your laptop using Docker: https://github.com/openwebwork/webwork2/wiki/Docker-newbie-instructions
Both documents are wiki's so comments, clarifications, corrections and additions are welcome. They are both versioned documents so mistakes can be corrected.