Fixed bug in api.load_configuration_object preventing plugin configurations from being read. Change 'r' to 'rb' for pickled file.
updated authors/changelog
woops, didn't know about changelog format
Started integration of week version of calendar_plugin into GTG.
* Has a lot of small bugs!
Using dialog to confirm deletion and TaskEditor when double-clicking task.
* Bugs:
  - Adding a task through Dnd is not working anymore.
  - When clicking on add/edit buttons, TaskEditor should be opened as well.
  - Delay in drawing tasks after being edited -> specially if dates were
    changed.
  - Closing calendar view quits GTG.
Using TaskEditor with add/edit buttons, and when adding task through DnD.
* Fixed bugs:
  - Adding a task through Dnd is not working anymore.
  - When clicking on add/edit buttons, TaskEditor should be opened as well.
* Set buttons sensitivity when there is no task selected.
  - WeekView now emmits a signal whenever selection changes.
Formatting according to PEP8.
Renamed update function to refresh.
Task created using DnD is only kept if any change is made (title, date, etc).
* The task is created, so we can display start/due date on the TaskEditor.
  However, if nothing is changed, we delete it after closing the editor.
* If task is created using Add button, behaviour is the same as before: it is
  only saved if something is changed.
Fixed delay in updating tasks after being edited using TaskEditor.
* Added callback to focus-in-event that refreshes content of plugin.
Fixed bug when new task was cancelled but was still tracked as selected_task.
Connected to liblarch tree callbacks to keep calendar always updated.
Managing calls to redraw/refresh so no unnecessary work is done.
Merge pull request #28 from mathematicalcoffee/fix_python3_pickle

Fixed bug preventing plugin configurations from being read
Fixed bug when canceling creation of task (or deleting task).
* It seems that the task was deleted, but not fast enough, so a DrawTask
  object was still being created for it.
* Now checking if task really exists before creating DrawTask.
Updating calendar when changing status of task in the browser.
Now displaying closed task in the calendar as well.
* The closed tasks are faded to indicate they are done.
Merge branch 'integration_with_gtg' of https://github.com/sararibeiro/gtg into sara
Fix closing calendar view closing window

Destroy event cannot be reverted. On the other side, delete event
provides option to stop destroying the window.