Summary:
Ref T2852. Primarily, this expands API access to Asana. As a user-visible effect, it links Asana tasks in Remarkup.
When a user enters an Asana URI, we register an onload behavior to make an Ajax call for the lookup. This respects privacy imposed by the API without creating a significant performance impact.
Test Plan: {F47183}
Reviewers: btrahan
Reviewed By: btrahan
CC: chad, aran
Maniphest Tasks: T2852
Differential Revision: https://secure.phabricator.com/D6274
