Note to self about LSP violation.
Tried to match the interfaces and code of Break and Pomodoro.
Implemented rules of the technique in the UI. The timer sequence is
PbPbPbPB (where P=Pomodoro, b=Short Break, B=Long Break).
Merge branch 'master' of
https://github.com/doughgle/pomodoro_evolved.git

Conflicts:
	pomodoro_evolved/rules_of_the_technique.py