Replace #gist-input div with a script tag and direct JS injection of the JSON object
Streamline setStorage logic
Rework gist parsing logic
Add owner to gist hash
Return 404 when the gist can\t be found
Refactor @plugins setting
Misc. clean up
Rename @gist variable
Refactor Gist saving and editing logic, both server- and client-side
Fix passing of @gist var when there is no Gist