SumWeekTimeAnalyzer started.

Added SumWeekTimeAnalyzer and started TDD
Change to right month field

Realized that the month has been set wrong in all tests. Remember to use
the public field determined by GregorianCalendar...
SumWeekTimeAnalyzer done

Fully implemented SumWeekTimeAnalyzer. Still needs documentation.
SumWeekTimeAnalyzer JavaDoc

Added JavaDoc to SumWeekAnalyzer.