Support accounts or github's gist

[myguidingstar-zz]

What if one want to update their paste? or track for changes? Make pasterack into a site with account may be overkill. A better approach imo is to support gist. Paste ids with "gist:" prefix should be looked up via gist API and then fetched and evaluated. A gist hook should be made so that the gist will be evaluated only once each update. https://developer.github.com/v3/activity/events/types/#gistevent What do you think?

[stchang]

Thanks for the report! This is a good idea. Others have suggested similar and I'm thinking about how to implement it. Unfortunately, I don't have a lot of time to work on it now so there may be a delay until I get a chance to push it out.