Added a cach for tasks.

getTasks created new instances of getTasks so that the attribute 'noted' were overwritten and triggering the alarm all the time
Added feature sound alarm

the alarm will only be triggerd one time the programm runs
generalized ReminderUpdate
working config file

.gitingnore why do you not work
bugfix in shell. FeatureIDE coudnt find right classes
Sound alarm clock plays only one sound at a time