created testclass TimerTest
added getter for timerLength int Timer-class
changed vissabillity of variables in Timer-class to private
added getter for startTime int Timer-class
added testmethod for Timers consrtuctor
added testmethod for start() in Timer
added testmethod for setTimerLength() in Timer
changed colors of shott-image
added testmethod for isTimerDone() in Timer
Merge branch 'master' of https://github.com/Kuxe/oopprojekt