bTimerFinished should be set to false in setup

The 'bTimerFinished' variable should be set to false when the setup function is called. Otherwise the 'getTimeLeftInSeconds' and 'getTimeLeftInMillis' functions will always return 0 when 'reset' has not been called.
Merge pull request #1 from HubyD/patch-1

bTimerFinished should be set to false in setup