polish up new file and image uploading+issues

Not-so-large (i.e., 240k) files can take 10 seconds, up to even a minute, or sometimes, we just get the spinning wheel forever.

Stop creating file/image cards in multi-edit if nothing uploaded

Auto-fill card name from image name

Fix full view for gifs - from Lew on Skype:

ImageScience doesn't handle all gifs properly, so it converts them to pngs for thumbnails.  It has something to do with trying to save gifs with a larger palette than 256 colors, which is all the gif format supports. One fix would be switch to different image processing back-end  (ImageMagick.. etc)

Option to delete

Handle mismatched/invalid mime types (at least decent err msg)

CSS pass-through to image

Can't upload .ico files (eternal spin; Application error?).

Much more in +discussion...