docker: updated Dockerfiles: - use HTTPS URLs instead of HTTP - prosody image know use prosody Debian repository instead of Debian Jessie version, prosody 0.10 is used - prosody configuration is now in prosody directory next to Dockerfile, instead of using difficult to maintain sed calls - community modules are downloaded from mercurial, and only needed ones are kept - no more remote-roster hack \o/ - pubsub component is not at pubsub.[domain] (was sat-pubsub before) - SàT media are gotten from hg instead of ftp, so they are up-to-date with SàT version - libervia image now use pip for txJSON-RPC - fixed now needed jinja2 installation - fixed libervia/admin accounts auto-creation script - fixed uid/gid for prosody in data image - removed not needed anymore nox option in base image - added python-pip in base image - docker images now work with current dev version (0.6.0D)

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