Changes for 1.3.0 (thanks Rijk Stofberg):
   - fixed bug in gantt generation
   - added colours to people.csv which is much more manageable

1.2.1
   - fixed internal use of person.estimateTaskEnd and person.findFreeWeek
     (thanks Thomas Handzsuj!)

1.2.0
   - changed csv module usage to python 2.3's

