gists-up per Francesco De Stefano

I needed an additional button for quick copy of Gist snippets and I wanted to share this WebExtension with you
Features
* A copy button added on each file in a Gist.
* Convert each file in a Gist into an expandable detail (accordion).
* Settings Page You can customize features by setting them on the options pages

Instructions
After installation go to the add-on preferences to customize the features. Finally visit any page hosted in Gist to see the features active

Further information
Add-on is based on [better-gists](https://github.com/farskid/better-gists) open-source browser extension