Merge tag 'sparks-1.3.6' into develop

1.3.6
Fix some remaining `sf.lsb` which should be spelled `remote_configuration.lsb`.
Clone my `pelican-themes` repository.
Centralization of my OSX Apps installers in a remote repository for easy download on all other machines.
Avoid pyflakes annoyance.
remote_configuration feature: be sure to `deactivate` before running, else we could be stuck in a virtualenv and guessing false information.
localhost can be ::1 too.
Small things, flake8 related.
Implement the pip2/pip3 detection and use. `pip3_usable()` always returns `False` for the moment, there is a bug when searching pip3 via `contrib/pkgmgr.py`. This doesn't prevent from using pip3_* functions from fabfiles.
Add python3 stuff in my fable.
Merge branch 'release/1.3.7'