Support APIs for importing data

[ryanmuller]

For example, using Github API, a "Hack on Shuff" task's actions could be populated by issues, and its logs by commit data.

With last.fm: "Discover music", actions = recommended artists, logs = scrobbled tracks

With researchr: "Read a paper", actions = to-read articles, logs = scrobbled articles

With learnstream: "Learn math", actions = just a link to study, logs = items studied

[ryanmuller]

And the ultimate gordian knot, shuffing shuff:

With shuff: "Do stuff", actions = links to random shuff tasks, logs = completed tasks