HGTV should use imgee for thumbnails

[jace]

HGTV's thumbnail storage has problems:

1. Images are stored on local disk, requiring a read/write filesystem and thereby creating the risk of a security breach.
2. HGTV can never be run off multiple servers because each server may or may not have a local copy of the thumbails.

We should migrate all thumbnails out of HGTV and into Imgee. This will require Imgee to provide an API endpoint that allows an app to post images directly into Imgee.

Since the images must be posted into the profile of an organization, and Imgee will not be aware of said organization unless an owning user has directly logged into Imgee, this will also require a mechanism for Lastuser to share such information with Imgee.

This means @kracekumar, @asldevi and @jace will be working together to provide the relevant APIs and functionality.