prevent too much bookkeeping in vendors/__init__.py by adding each vendor.__name__ to __all__ from the vendors list.

imbox/vendors/__init__.py

@@ -5,6 +5,7 @@ vendors = [GmailMessages]
 hostname_vendorname_dict = {vendor.hostname: vendor.name for vendor in vendors}
 name_authentication_string_dict = {vendor.name: vendor.authentication_error_message for vendor in vendors}
 
-__all__ = ['GmailMessages',
-           'hostname_vendorname_dict',
-           'name_authentication_string_dict']
+__all__ = [v.__name__ for v in vendors]
+
+__all__ += ['hostname_vendorname_dict',
+            'name_authentication_string_dict']