Select profile image from Asana correctly
Summary: Ref T2852. The picture field is actually a dictionary of options. Choose the largest photo.
Test Plan: Logged in with Asana and saw my profile image populate correctly.
Reviewers: btrahan
Reviewed By: btrahan
CC: aran
Maniphest Tasks: T2852
Differential Revision: https://secure.phabricator.com/D6431