Added possibility to create an event with a start time, but no end time.
If you set the start and end at the same date and time, the output will be "01.01.2014 08:00" instead of "01.01.2014 08:00 - 08:00".
Merge pull request #150 from 4teamwork/jin-date-output

Added possibility to create an event with a start time, but no end time.