First version!

Having some experience with finetuning GLIDE on laion/alamy, etc. I think this code works great now and hope as many people can use it as possible. Please file bugs - I know there may be a few.

New additions:

• dataloader for LAION400M
• dataloader for alamy
• train the upsample model instead of just the base model
• (early) code for training the released noisy CLIP. still a WIP.