merge branch 'release-1.0.1' into develop
comment old implementation
keep render_timedelta
add LogHelper base class
add missed import
add sameline documentation
fix sameline encoding typo
minor change; stop patching
implement Labeller
implement Spinner
add missed documentation
fix ReST s/:$/::/
implement Counter
implement Timestamper
add missed documentation
implement ProgressTracker
add LogHelper tests
clean commented lines
change variable name for consistency
implement CompositeHelper