Important: HTTP/2 is available in Nginx 1.10 stable. So from EasyEngine 3.6.0 support for Nginx Mainline is not needed, hence removed.
NGINX has released HTTP/2 support in its mainline version and not in its stable version yet. Mainline version of NGINX has other features too.
For the users who wants to use NGINX mainline version or wants to enable HTTP/2 on their websites they need to explicitly install NGINX mainline with EasyEngine. EasyEngine made this task easy for the users with following single command.
ee stack install --nginxmainline
ee stack remove --nginxmainline
ee stack purge --nginxmainline
ee stack remove --nginx
ee stack install --nginxmainline
root@example.com:~$ nginx -v
nginx version: nginx/1.9.0
ee stack remove --nginxmainline
ee stack install --nginx
--nginxmainline
is not available with ee site create example.com