Use cURL with a User Agent for Reddit in getChannelThumbnail()
Rudimentary checking of valid feed value in api->channel_thumbnail
Use cURL once to save image to a temp file for reading of mimetype in getYoutubeThumbnail()
Add USE_SQLITE for dev purposes
There's no AJAX check for non-admin AJAX functions
Make sure every row is looped in getChannelThumbnail()