Fix bug is_logged function

closes #1423

Signed-off-by: Vincent Texier <vit@free.fr>
Signed-off-by: Romain Bignon <romain@symlink.me>
backport some youtube-dl changes (closes #1422)
[hybride] handle summer holyday in tests
[feedly] New module feedly
[filters] manage default in Dict filter
[filter] manage basestring entry in CleanHTML filter
[hybride] fix pyflakes
[repl] in do_ls goes fully back  when there is a / in path
support python3 (closes #1417,#1418,#1419)
fix detection of python version and output
fully support python3