Add MIT license file
Update composer meta info
Add dummy CHANGELOG
Add README
Typehint against Stream (fixes #5)
Fixes compatibility with react/stream:0.4 which removed the
StreamInterface.
Explicitly state expected end event, fixes agents()
Simplify creating action request
Action no longer sets an ActionID internally
Client is now responsible for creating (truly) unique ActionIDs
Merge branch 'actionid' into collector
Unit tests for collector