Proxy support wanted

Hi folks,

unfortunatelly, the google-task-indicator does not recognize the proxy system settings...

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Google-Tasks-Indicator version: 0.5.2-0.extras14.04.0
#####################################################
Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/urllib3/connectionpool.py", line 537, in urlopen
    conn = self._get_conn(timeout=pool_timeout)
  File "/usr/lib/python3/dist-packages/urllib3/connectionpool.py", line 299, in _get_conn
    return conn or self._new_conn()
  File "/usr/lib/python3/dist-packages/urllib3/connectionpool.py", line 719, in _new_conn
    return self._prepare_conn(connection)
  File "/usr/lib/python3/dist-packages/urllib3/connectionpool.py", line 686, in _prepare_conn
    connection.connect()
  File "/usr/lib/python3/dist-packages/urllib3/connectionpool.py", line 124, in connect
    self._tunnel()
  File "/usr/lib/python3.4/http/client.py", line 805, in _tunnel
    message.strip()))
OSError: Tunnel connection failed: 407 Proxy Authentication Required

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/requests/adapters.py", line 330, in send
    timeout=timeout
  File "/usr/lib/python3/dist-packages/urllib3/connectionpool.py", line 584, in urlopen
    'Socket error: %s.' % e)
urllib3.exceptions.ProxyError: Cannot connect to proxy. Socket error: Tunnel connection failed: 407 Proxy Authentication Required.

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/share/google-tasks-indicator/preferences_dialog.py", line 263, in on_switch1_changed
    if gta.do_refresh_authorization() is None:
  File "/usr/share/google-tasks-indicator/services.py", line 340, in do_refresh_authorization
    response = self.session.request('POST',self.token_url,data=data)
  File "/usr/lib/python3/dist-packages/requests/sessions.py", line 383, in request
    resp = self.send(prep, **send_kwargs)
  File "/usr/lib/python3/dist-packages/requests/sessions.py", line 486, in send
    r = adapter.send(request, **kwargs)
  File "/usr/lib/python3/dist-packages/requests/adapters.py", line 381, in send
    raise ProxyError(e)
requests.exceptions.ProxyError: Cannot connect to proxy. Socket error: Tunnel connection failed: 407 Proxy Authentication Required.
==================================

$ env | grep -i "proxy"

http_proxy=http://user:password@1xx.1xx.1xx.2xx:8080/
UBUNTU_MENUPROXY=1
https_proxy=https://user:password@1xx.1xx.1xx.2xx:8080/
no_proxy=1xx.1xx.0xx.0xx./24,1xx.1xx.2xx.3xx/24

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Is it possible to add this feature for authenticating through proxy servers ?

Regards