Update elixir version
Let WatchGroupServer build file index
Update to-be API in README
Complete Rotor.FileWatcher
Use a shorter method call for getting group info
Remove Rotor.Server
Cleanup rotor.ex
Remove event server
Cleanup watch group server
FileWatcher and WatchGroupServer cleanedup
Set length of changed files as 0
Plan to start file watchers for each group
Tests pass again; Seperation of concerns complete