These are Sublime Text snippets we use day-to-day at Electric Book Works.
For how to install and edit snippets in Sublime, this is a great article.
In short, save any snippet to /Sublime Text 3/Packages/User. This location may vary by operating system and machine. On a Windows machine it may be C:\Users\YourUserName\AppData\Roaming\Sublime Text 3\Packages\User (where YourUserName is your user name on the machine).
To use a Sublime Text snippet, you type a particular series of characters then hit tab to trigger the snippet. For each of these, open the snippet code and read the tabTrigger to know what to type.