hypercore now works pretty well, it's time to implement the networking part.

Todos

• implement feed.announce() (ref)
• implement feed.unannounce() (ref)
• implement pub feed.has() (ref)
• implement pub feed.has_all() (polymorphic variant of feed.has())
• implement pub feed.head() (ref)
• implement pub feed.replicate() (ref)
• implement pub feed.update() (ref)
• implement pub feed.downloaded() (ref)
• implement pub feed.finalize() (ref)
• implement Peer struct
• implement futures channel for events
• implement Event enum

Bonus

• implement pub feed.cancel() (ref)
• implement pub feed.clear() (ref)
• implement pub feed.seek() (ref)

Skipping

• implement pub feed.download() (ref)
• implement pub feed.undownload() (ref)

Resources

• source: replicate.js
• test: streams.js
• test: replicate.js
• bench: replicate-16kb-blocks