new system to load backends

Now there is a single file ~/.weboob/backends, where every backends are
instancied. There are two ways to create backends for frontends:
- Use Weboob.load_backends(), to load every backends in the config file
- Use Weboob.load_modules(), to instanciate every module one time

weboob/backends/aum/backend.py

@@ -22,6 +22,7 @@ from weboob.backend import Backend
 from weboob.capabilities.messages import ICapMessages, ICapMessagesReply
 
 class AuMBackend(Backend, ICapMessages, ICapMessagesReply):
+    NAME = 'aum'
     MAINTAINER = 'Romain Bignon'
     EMAIL = 'romain@peerfuse.org'
     VERSION = '1.0'

weboob/backends/canaltp/backend.py

@@ -24,6 +24,7 @@ from weboob.capabilities.travel import ICapTravel, Station, Departure
 from .browser import CanalTP
 
 class CanalTPBackend(Backend, ICapTravel):
+    NAME = 'canaltp'
     MAINTAINER = 'Romain Bignon'
     EMAIL = 'romain@peerfuse.org'
     VERSION = '1.0'

weboob/backends/dlfp/backend.py

@@ -24,10 +24,14 @@ from weboob.capabilities.updatable import ICapUpdatable
 from feeds import ArticlesList
 
 class DLFPBackend(Backend, ICapMessages, ICapMessagesReply, ICapUpdatable):
+    NAME = 'dlfp'
     MAINTAINER = 'Romain Bignon'
     EMAIL = 'romain@peerfuse.org'
     VERSION = '1.0'
     LICENSE = 'GPLv3'
+    CONFIG = {'username': Backend.ConfigField(description='Username on website'),
+              'password': Backend.ConfigField(description='Password of account', is_masked=True)
+             }
 
     def iter_messages(self):
         articles_list = ArticlesList('newspaper')

weboob/backends/dlfp/feeds.py

@@ -21,7 +21,7 @@ Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 from logging import warning
 import feedparser
 import re
-import datetime
+from datetime import datetime
 
 class Article:
     RSS = None

weboob/backends/transilien/backend.py

@@ -25,6 +25,7 @@ from .browser import Transilien
 from .stations import STATIONS
 
 class TransilienBackend(Backend, ICapTravel):
+    NAME = 'transilien'
     MAINTAINER = u'Julien Hébert'
     EMAIL = 'juke@free.fr'
     VERSION = '1.0'