Merge branch 'dev'
Added missing syntax highlighting in README
Small enhancements in README
Ensure Actor.sender is always available, even if None
Properly delegate Actor.get to Cell.get
Added Actor.get_nowait
Added Ref.send_later
Added Actor.reply
Renamed Cell.{impl => actor}
Put the actor back to 'processing' state if a pending get() times out
Fixed get_context()
Changed Actor.get to always take exactly one pattern
Improved repr of DeadLetter
Use get_context for spawning TempActors
Removed an unused import
Moved TypeRef under its own module
Added Ref.{ask and forward}
Fixed sender detection in Ref.send
Updated DeadLetter filtering in Ref.send
Simplified contrib.filetransfer to just work with fetching files to disk for now