Asynchronous file upload.
Thumbnails generation.
Ability to load images from external servers.
Fix up external file upload mess.
Fix relative url handling
Use current host with Socket.IO
Slash! Not backslash...
Merge pull request #37 from pfoltyn/master

SocketIO file upload + thumbnails generation
Send files in 128kB chunks and display progress.
Uploading in chunks. Uploading camera snapshot. Cloning existing files on edit.
Ask for password when deleting image.
Reproduce saved image from log
logo fix
logo fix for static sandbox page
Merge branch 'master' of https://github.com/Pioneer-Valley-Open-Science/infragram-js into fileupload
Move upload state tracking from server to client.
Fallback to ajax when websocket is iffy.
Inform user that saving is in progress.
Disable socket.io logging.
minor logo and other tweaks
Merge https://github.com/pfoltyn/infragram-sandbox into fileupload