Load and save percival files in git repos about percival

[justjake]

It'd probably be easier to program directly against the Github API, authenticated using one of the OAuth flows rather than emulate a whole file-system in memory and work with Git's data structures.

[infogulch]

What api enables you to traverse the repo and commit to it? That's what git is for.

[infogulch]

To clarify, my goal with this is would be to add a new way to persist changes made to the document other than exporting a brand new gist every time which is awkward to manage.

Potential follow up features could include: 1. opening other percival documents from the main site (point to a git url), 2. multi-document workflows, where a table defined and exported by one document is imported and used in another, etc.