Persisting per-user Data Explorer config (incl e.g. list of projects)

[rufuspollock]

For time being will just be the list of projects.

{
projects: [{
  id: ...
  gist_id: ... # maybe the same
  state: active | deleted
}
  ....
]
}

Persistence to special gist

Name: DataExplorerConfig.json

Boot sequence:

• if not logged in: END
• (if logged in) get all gists: http://developer.github.com/v3/gists/#list-gists
• search for DataExplorerConfig.json
  • if it does not exist, we create local model DataExplorerConfig and have empty list of projects
  • if does load data and initialize DataExplorerConfig with it

Persistence is automatic on each change ...

[djw]

Instead of creating a special gist, we're going to look for gists that contain a file called datapackage.json. Working on a pull request now.