whitespace
rename listener to subscriber
prefer stable packages

They do not take forever to install.
Merge pull request #134 from greg0ire/backwards-compatible

rename listener to subscriber
spelling
rename listener with subscriber when appropriate
Merge pull request #135 from greg0ire/backwards-compatible

Replace most occurences of listener with subscribers
cs
use the event system to map fields
Merge pull request #136 from greg0ire/use_event_system

Use event system
Update README.md
bump branch-alias version