Task list broken on python3.3

[mriehl]

Due to python3's more consistent ordering checks, tasks are not sortable anymore (and the task listing command tries to sort them).

mriehl@ixion:~$ virtualenv v3 -p `which python3.3`
Running virtualenv with interpreter /usr/bin/python3.3
Using base prefix '/usr'
New python executable in v3/bin/python3.3
Also creating executable in v3/bin/python
Installing distribute.................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................done.
Installing pip................done.
mriehl@ixion:~$ . v3/bin/activate
(v3)mriehl@ixion:~$ pip install pybuilder
Downloading/unpacking pybuilder
  Downloading pybuilder-0.9.8.tar.gz
  Running setup.py egg_info for package pybuilder

Installing collected packages: pybuilder
  Running setup.py install for pybuilder
    changing mode of build/scripts-3.3/pyb from 664 to 775

    changing mode of /home/mriehl/v3/bin/pyb to 775
Successfully installed pybuilder
Cleaning up...
(v3)mriehl@ixion:~$ pyb -t
Tasks found for project "mriehl":
Traceback (most recent call last):
  File "/home/mriehl/v3/bin/pyb", line 23, in <module>
    sys.exit(pybuilder.cli.main(*sys.argv[1:]))
  File "/home/mriehl/v3/lib/python3.3/site-packages/pybuilder/cli.py", line 275, in main
    print_list_of_tasks(reactor)
  File "/home/mriehl/v3/lib/python3.3/site-packages/pybuilder/cli.py", line 247, in print_list_of_tasks
    for task in sorted(tasks):
TypeError: unorderable types: Task() < Task()