Python util for uploading files to swarm

creates folder in home named .swarmsync where it stores lists

features

• saves references
• keeps upload list in todo, so you can resume or retry failed or canceled uploads.
• support concurrent uploads (to the same endpoint)
• can check stewardship of uploaded references

todo:

• merge stewardship responses into responses list
• improve readme
• add support for private files/single owner chunks
• add mac build