Use $.ajax instead of $.post

$.post is a shortcut and it doesn't provide the same frlexibility as
$.ajax.
Here we use $.ajax, provide a dataType for expected data format and an
error callback.
Also :
* remove console.log calls
* Remove trailing comma
* Add missing semi colon
Split recent_task view and its related panel

The recent_task panel provides a list of tasks.
The recent_task view is only a wrapper around this panel, it doesn't
handle any datas itself.

Here :
* we move the code belonging to the panel to the panels/company.py
module
* we move the template stuff belonging to the panel to
  templates/panels/tasklist.mako
Include the new panel module in our app's config