installing atom and syncronise settings between windows and mac versions.

Install the package Syncronize Settings

the package is called sync-settings but searching for sync-setting and Syncronize Settings should also find it. 

once its installed it will ask for your gist id where it can load and save the settings

then enter your gist id (or create one if this is a new installation), and then you can restore your backup from this gist. 

You are now synced! It should load all of your package settings from your gist settings.