expose internal class LogEvent
method printf() now return LogEvent instead of void
Add TextView object storage support in class ConfigureRepository
add method getAssociatedTextViews()
change getAssociatedTextViews() return type to
Collection<WeakReference<TextView>>
add support for println log in TextView
add method to unassociate TextView from logger
fix bug of only print one log in TextView
fix bug that throwing NullPointerException when associated TextView and
LogEvent is null
change version to 0.4.1